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OK, we all know about Verizon using lower spectrum and AT&T using upper spectrum of 700MHZ but i could never understand how HARDWARE WISE they can make a radio that would only support such a thing, I am under impression that it is the software optimized for using either upper or lower spectrum and if block the other half. I just read how flashing correct radio enabled AT&T GALAXY NOTE to be used on t-mobile, i am not an expert nor i have resources, but has anyone attempted to flash verizon radio on at&t phone or vice versa and see if phone is actually capable of running on both networks? Please explain me if there is any flow in my understanding or is it actually feasible? would be great to break monopoly of at&t and Verizon over their LTE phones even though they utilize same 700MHZ band.
nakamoniel said:
OK, we all know about Verizon using lower spectrum and AT&T using upper spectrum of 700MHZ but i could never understand how HARDWARE WISE they can make a radio that would only support such a thing, I am under impression that it is the software optimized for using either upper or lower spectrum and if block the other half. I just read how flashing correct radio enabled AT&T GALAXY NOTE to be used on t-mobile, i am not an expert nor i have resources, but has anyone attempted to flash verizon radio on at&t phone or vice versa and see if phone is actually capable of running on both networks? Please explain me if there is any flow in my understanding or is it actually feasible? would be great to break monopoly of at&t and Verizon over their LTE phones even though they utilize same 700MHZ band.
Click to expand...
Click to collapse
Certain chipsets with an integrated radio/modem support multiple bands. Like you said, in the case of the Note, XDA devs were able to flash a different modem that told the radio to tune to a different frequency that it supported. Same with the Skyrocket, and, if the T-Mobile SII had an LTE mode, that would have worked too. But not all chipsets can do multiple frequencies on one chip.
Well you'll have a problem of dealing with a CDMA phone trying to run on a GSM network primarily. I think Verizon's system has to verify you're on their primary CDMA network then allow you to connect to their LTE network. Where as an AT&T phone would just connect you to their GSM and then it bumps up to LTE. My speculation is that if you connect a Verizon World Phone with LTE on AT&T with the correct radio it MIGHT work. But it won't work the other way around as AT&T's phones don't have CDMA (which is used to verify and connect you to the LTE network)
ChpStcksRlz said:
Well you'll have a problem of dealing with a CDMA phone trying to run on a GSM network primarily. I think Verizon's system has to verify you're on their primary CDMA network then allow you to connect to their LTE network. Where as an AT&T phone would just connect you to their GSM and then it bumps up to LTE. My speculation is that if you connect a Verizon World Phone with LTE on AT&T with the correct radio it MIGHT work. But it won't work the other way around as AT&T's phones don't have CDMA (which is used to verify and connect you to the LTE network)
Click to expand...
Click to collapse
You will never get a CDMA phone to work on a GSM network or vice versa (aside from global CDMA phones with SIM slots for GSM roaming). LTE phones on Verizon use a their own authentication that's separate from their CDMA-only 3G phones. With the LTE phones, there is no ESN/MEID associated with the device; it's the SIM that is authenticated and then the phone attached to it can use it to transmit and receive data, texts, and calls.
But that's besides the fact; CDMA and GSM are more than just frequencies; they're two different methods on how a phone communicates with towers. CDMA is Code Division Multiple Access, and GSM is based off of TDMA, which is Time Divided Multiple Access. It's kind of like saying, because two people are Chinese, they will both speak one dialect, which in fact there are two; Mandarin (GSM) and Cantonese (CDMA) which are similar but different.
Product F(RED) said:
You will never get a CDMA phone to work on a GSM network or vice versa (aside from global CDMA phones with SIM slots for GSM roaming). LTE phones on Verizon use a their own authentication that's separate from their CDMA-only 3G phones. With the LTE phones, there is no ESN/MEID associated with the device; it's the SIM that is authenticated and then the phone attached to it can use it to transmit and receive data, texts, and calls.
But that's besides the fact; CDMA and GSM are more than just frequencies; they're two different methods on how a phone communicates with towers. CDMA is Code Division Multiple Access, and GSM is based off of TDMA, which is Time Divided Multiple Access. It's kind of like saying, because two people are Chinese, they will both speak one dialect, which in fact there are two; Mandarin (GSM) and Cantonese (CDMA) which are similar but different.
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Click to collapse
some CDMA+LTE devices can be used with other carriers even with the different authentication, carriers that barely have 1X cdma coverage. the conversion of the MEID to pESN is done with a different method that is of course if the DEC MEID can be retrieved, not the HEX MEID.
nakamoniel said:
OK, we all know about Verizon using lower spectrum and AT&T using upper spectrum of 700MHZ but i could never understand how HARDWARE WISE they can make a radio that would only support such a thing, I am under impression that it is the software optimized for using either upper or lower spectrum and if block the other half. I just read how flashing correct radio enabled AT&T GALAXY NOTE to be used on t-mobile, i am not an expert nor i have resources, but has anyone attempted to flash verizon radio on at&t phone or vice versa and see if phone is actually capable of running on both networks? Please explain me if there is any flow in my understanding or is it actually feasible? would be great to break monopoly of at&t and Verizon over their LTE phones even though they utilize same 700MHZ band.
Click to expand...
Click to collapse
Hardware wise it's damn easy to make a radio that doesn't support the upper/lower part of the band - just use a narrower frontend filter.
In fact, doing the opposite is hard - having wideband support without compromising the performance of your bands of primary interest is extremely difficult. Filtering out the "don't care" part of the 700 MHz band can improve RF performance in the "do care" part.
Product F(RED) said:
Certain chipsets with an integrated radio/modem support multiple bands. Like you said, in the case of the Note, XDA devs were able to flash a different modem that told the radio to tune to a different frequency that it supported. Same with the Skyrocket, and, if the T-Mobile SII had an LTE mode, that would have worked too. But not all chipsets can do multiple frequencies on one chip.
Click to expand...
Click to collapse
No, they didn't do anything to tune a different frequency. AT&T also uses AWS1700 for LTE - all they did was change modulation mode for an already supported band.
EVDO logins does not need to verify the ESN/MEID.
See http://shadowmite.com/forum/viewtopic.php?f=24&t=3319
not sure about LTE
I see thread being carried away in different direction, I understand how it used to be completely ESN based, but trust me on new LTE phones it doesnt matter, i have popped sim card into many lte devices without registering with verizon what so ever, Also both at&t and verizon phones have hardware radio built in that supports 700MHZ so that is out of question as well, Hence I would like to draw attention of everyone specially DEV's, to target the real question, is it software based solution where they have tuned radio only to support perticular upper or lower band making them carrier specific? and if so flashing verizon radio on at&t phone or at&t radio on verizon phone make it compatible with each other? IF ANYONE OUT THERE WITH RESOURCES AND knowledge of radios can try this theory, it would open infinite gates of new possibilities ( AND GIVE US ALL AN OPPORTUNITY TO SCALE UP OUR LOVE-HATE RELATIONSHIP WITH ATT-VERIZON BASTARD ).
p.s. I appreciate sharing your concerns/understanding anyways, not trying to underscore your comments, just trying to get things moving in right direction.
Thanks, its kind of answer I was looking for to verify my doubt on whether it would be possible by software tweak to enable phones work on other networks, however my speculation is that there is a huge probability that some MODELS did not bother making this changes (e.g. motorola since they do not produce phones for at&t anyways or quite oppositely HTC which makes LTE phone for both att & verizon) and simply had software tweaks in place to avoid phones on other networks, IF SO it should be as simple of radio files swap as what other guy did to samsung tab. Please correct me if i am still wrong.
Entropy512 said:
Hardware wise it's damn easy to make a radio that doesn't support the upper/lower part of the band - just use a narrower front end filter.
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Click to collapse
nakamoniel said:
Thanks, its kind of answer I was looking for to verify my doubt on whether it would be possible by software tweak to enable phones work on other networks, however my speculation is that there is a huge probability that some MODELS did not bother making this changes (e.g. motorola since they do not produce phones for at&t anyways or quite oppositely HTC which makes LTE phone for both att & verizon) and simply had software tweaks in place to avoid phones on other networks, IF SO it should be as simple of radio files swap as what other guy did to samsung tab. Please correct me if i am still wrong.
Click to expand...
Click to collapse
Samsung tab? Are you talking about the AT&T Galaxy Note? In that case, that was changing modulation modes in the same band. (AT&T also uses the 1700 MHz AWS band for LTE. So it's easy to just change that over to HSPA+ for T-Mo compatibility.)
I would not be surprised if Moto has narrower frontent filters, that may be part of the secret to their supposedly superior radio performance. (Rejecting unnecessary bands can greatly improve reception of the bands you care about.)
Hi guys, i have an S5 bought unlocked in belgium, europe. I had 4G in europe but in the United States it only receives H+. I checked the supported bandwidths with tmobile usa, two of the bands tmobile uses are in fact also supported by my phone (1800 & 1900) yet still it doesnt work. APN setting are already checked and confirmed correct. Sim card is brand new.
Since it still doesn't work, is there a way to flash a USA rom or upgrade something technical so i can get 4G? I would hate to have to buy a new phone again, i just bought this 4weeks ago thinking it would work globally
Thanks again for recommending the best possible option for me at this point...
Most of your questions here were posed and answered in your other thread.
Your 900F model phone is intended for use in a different country. TMobile uses a 900T model. The main difference between the two is that they support a different set of frequency bands. So just like roaming you could use your 900F phone on TMB, but there will be gaps in coverage. You will be subject to more congestion and dropped calls. And in smaller centers where a limited number of frequencies are in use, you may have no coverage at all.
If you never get LTE in a major center on your unlocked 900F, the first thing to check is that you have a LTE capable SIM and that your carrier i.e. TMB has provisioned your account for LTE. And try installing the latest version of firmware for your phone.
No, you cannot simply flash a 900T firmware onto a 900F and have it transform into the other model. By design, Samsung doesn't allow this (to sell more phones and deter carrier churn). There is a hack to add the AWS band to some models. And several threads endeavoring to expand upon that. However they are nascent and would be best described as experimental, dangerous (a good chance of damaging your phone) and with uncertain results as of this date.
Unless you want to put your phone at risk to be a guinea pig, your options are to live with the imperfect coverage or buy a 900T model.
If you want to take a risk, then have a look at this thread. And here. Basically you could use QPST or mzTools 1.21.a to format an edit NV_RF_BC_CONFIG_l to enable additional LTE bands. Enable the parameters with QXDM, then do the actual write with QPST. And /or try writing a raw image of an LTE enabled variant e.g. 900T baseband to your 900F modem partition with the dd utility. This is experimental. It may do what you want or it may brick your phone.
.
ignore - double post
4G 900F in USA
Oké so turns out i am getting 4G just not LTE because of the state i am in. Thanks for trying but what i initially said was correct all S5s are global capable of 4G, just state dependant on the LTE band...
fffft said:
There is a hack to add the AWS band to some models. And several threads endeavoring to expand upon that. However they are nascent and would be best described as experimental, dangerous (a good chance of damaging your phone) and with uncertain results as of this date..
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Click to collapse
That's not quite true. The chance of damaging the phone is extremely small if you follow the instructions.
The thread to unlock all GSM and LTE bands is here.
..
fffft said:
It is true when I'm not quoted out of context. And especially funny that you link to that particular thread to .. prove me wrong?
You didn't realize that the thread you linked to was also authored by me. Funny stuff.
.
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How exactly is that out of context? What important piece of information did I leave out to distort your words? Call bs on that. But yeah I didn't notice that it was your thread I linked to , good job on that thread. :good:
Guys,
Is it sufficient to select right bands in LG G2 Service menu 3845#*801# to make it work overseas?
Or only modem/radio firmware flash can switch bands?
I do know, the carrier I want to use phone with has different bands, than TMO in US.
And I do see these bands in service menu on my LG.
I guess, it’s probably a lame question, everybody knows an answer to, so it kinda difficult to google out…
To mods: I’m not even sure, if this question right for Troubleshooting section...
The g2 variants have different modems, 3G bands are universal, 4G not.
_____________________________________Read more write less and be smart
siggey said:
The g2 variants have different modems, 3G bands are universal, 4G not.
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Click to collapse
Ok. Could you clarify a bit, please?
On mine 801, LTE Band selection menu shows way more bands, than 801 officially supports.
Does 801 really support all of them?
Do "g2 variants" with different modems (i.e. different hardware) show different set of bands (and really support them all as well)?
And this one too:
"3G bands are universal, 4G not"
Do you mean 4G same freq. bands (in different countries) are in fact different in something else (encoding or whatever)?
siggey said:
Read more write less and be smart
Click to expand...
Click to collapse
I’d really appreciate, if you can point where I can read about it myself.
Thank you!
I mean that there are hardware limitations and the modem (hardware) is different from one country to another, so from one variant to another. In service menu you can see a lot of things but you cant change nothing in frq selection. You can use your phone all over the world in 3G (gsm umts) mode but not in 4G (lte) mode.
_____________________________________Read more write less and be smart
siggey said:
I mean that there are hardware limitations and the modem (hardware) is different from one country to another, so from one variant to another. In service menu you can see a lot of things but you cant change nothing in frq selection. You can use your phone all over the world in 3G (gsm umts) mode but not in 4G (lte) mode.
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Click to collapse
Make sense…
I do remember some sort of discussions about changing frequencies via flushing different modem firmware. Tho, not even sure, which phone it was about. I guess, could be possible if hardware supports it.
From the other hand, it might be cheaper for manufacturer to solder preprogrammed chip/module to support fixed set of bands…
Thank again!
And differents antennas
_____________________________________Read more write less and be smart
I can't find any definitive answers on this. All I know is the minimum is 25, 26 and 41 but it'd be nice to know the full list. I travel internationally and without other LTE bands like band 7, it makes it tough to use it anywhere outside the US.
EDIT: Someone answered this question in another thread but it would be good to get screenshots to verify this.
m03sizlak said:
LTE Bands: 2 / 4 / 5 / 7 / 12 / 13 / 25 / 26 / 41
I've heard that the FCC filings show that the Sprint variant is not capable (tested or approved) for GSM or WCDMA, which is kind of disappointing since I travel a lot in Canada. Any confirmation on this?
Click to expand...
Click to collapse
This list of bands is a little better than both the Sprint variants of the LG G5 and Samsung Galaxy S7. If this phone can be unlocked, you at least have a way to go abroad and use LTE connections in much of Europe and elsewhere. Band 7 is the most common band in the world from what I understand.
I'm curious about this comment about GSM and WCDMA. Hopefully someone can verify this one way or another.
asuh said:
I'm curious about this comment about GSM and WCDMA. Hopefully someone can verify this one way or another.
Click to expand...
Click to collapse
Did you ever get an answer on this? I have a Sprint variant of the 10 and am trying to unlock it as I will be travel for the next 2 years. I've done everything I can think of but cannot get the phone's radio to work with any unlocked ROM. I could use some help here. Any advice or information you can provide?
vijn said:
Did you ever get an answer on this? I have a Sprint variant of the 10 and am trying to unlock it as I will be travel for the next 2 years. I've done everything I can think of but cannot get the phone's radio to work with any unlocked ROM. I could use some help here. Any advice or information you can provide?
Click to expand...
Click to collapse
If you plan to travel outside the US during most of this time, your best options are to sell your HTC 10 and get one of the few unlocked flagship phones on Sprint's networks, assuming you want to stay with Sprint.
Here are your options:
Google Pixel
Samsung Galaxy S7 SM-930U
Samsung Galaxy S7 SM-935U
Nexus 6P or 5X
Motorola X Pure Edition
Apple iPhone
Here's a full list as of February 2017 of radio unlocked phones compatible with Sprint.
There are other unlocked phones that are not compatible with Sprint because CDMA and LTE bands are crippled or missing.
asuh said:
If you plan to travel outside the US during most of this time, your best options are to sell your HTC 10 and get one of the few unlocked flagship phones on Sprint's networks, assuming you want to stay with Sprint.
Here are your options:
Google Pixel
Samsung Galaxy S7 SM-930U
Samsung Galaxy S7 SM-935U
Nexus 6P or 5X
Motorola X Pure Edition
Apple iPhone
Here's a full list as of February 2017 of radio unlocked phones compatible with Sprint.
There are other unlocked phones that are not compatible with Sprint because CDMA and LTE bands are crippled or missing.
Click to expand...
Click to collapse
Thanks for the response. The thing is I'm not on Sprint and have no desire to be. I won't be in the states long. I bought the phone thinking that like most, it could be unlocked and used as needed wherever I travel to. I knew it wasn't unlocked but figured I could do it myself. Well, I've tried a number of times, and keep having an issue with the radio. Can you explain what you mean by bands being crippled? What I'm trying to find out now is whether it's possible for me to get this HTC10 completely unlocked. I think I've done everything right but maybe not. I'm kinda desperate at this point. I love this phone. And if I have to I'll return it and grab another that can be unlocked but I just have a hard time believing that the phone can't be unlocked. It's a strange concept for me. Any help or info would be appreciated.
vijn said:
Thanks for the response. The thing is I'm not on Sprint and have no desire to be. I won't be in the states long. I bought the phone thinking that like most, it could be unlocked and used as needed wherever I travel to. I knew it wasn't unlocked but figured I could do it myself. Well, I've tried a number of times, and keep having an issue with the radio. Can you explain what you mean by bands being crippled? What I'm trying to find out now is whether it's possible for me to get this HTC10 completely unlocked. I think I've done everything right but maybe not. I'm kinda desperate at this point. I love this phone. And if I have to I'll return it and grab another that can be unlocked but I just have a hard time believing that the phone can't be unlocked. It's a strange concept for me. Any help or info would be appreciated.
Click to expand...
Click to collapse
First, go go Google and look up what LTE bands are.
Crippled LTE bands = the hardware inside the phone will not allow certain LTE bands to work unless physically altered. It doesn't matter which ROM you install, you will not unlock all the LTE bands without physical alteration. https://www.quora.com/Does-installing-different-rom-change-LTE-band-frequency
So no, HTC 10 will never be completely unlocked. Look at the list above and buy one of those phones if you want a completely unlocked phone.
asuh said:
First, go go Google and look up what LTE bands are.
Crippled LTE bands = the hardware inside the phone will not allow certain LTE bands to work unless physically altered. It doesn't matter which ROM you install, you will not unlock all the LTE bands without physical alteration. https://www.quora.com/Does-installing-different-rom-change-LTE-band-frequency
So no, HTC 10 will never be completely unlocked. Look at the list above and buy one of those phones if you want a completely unlocked phone.
Click to expand...
Click to collapse
I'm not sure I fully understand. Yes, I know that different chips have different bands that they work with. So, what you're saying is the Sprint HTC10 variant uses either a different chip or has some sort of other hardware configuration that is incompatible with GSM and the wider LTE bands and that no matter what I do with this phone I'll never have a truly unlocked phone? That's what I have understood, so my best option is to send it back. Ok, I get that. But I have read across tons of forums and threads of people who unlocked their Sprint 10s and are able to use them on other non-cdma carriers. So, how does that work? Are all the Sprint 10s the same or are some more limited than others? Are you essentially saying that i would have to get an unlocked/dev edition of the htc10 to be able to use GSM in other countries?
Sorry if i'm asking stupid questions here, I'm just trying to fully understand this. Thanks again for helping me out on this.
If anyone reading this knows better, please feel free to correct me.
This is my understanding of LTE bands and CDMA/GSM radios.
Phones like HTC 10, which are locked, include hardware that are built for specific usages. Prior to HTC 10, HTC phones built for Sprint's CDMA radio were specifically built to lock out GSM radio signals and most other LTE bands using the hardware. This means you'd have to open the physical device and modify the wiring inside the phone in order to allow other signals to work.
As of HTC 10, the locks are supposedly now just software based but I haven't seen proof of that. What this essentially means is that you should be able to unlock the bootloader and flash new Roms that could allow the GSM radio to work universally. However, lots of people are having issues with it. Here's one story of someone who was mostly successful but still had issues:
https://forum.xda-developers.com/showpost.php?p=68960210&postcount=47
Read through the thread above and you'll see a lot of people having issues trying to fully unlock the radios and LTE bands for this phone.
If you ultimately don't want to be on Sprint anyway, I think you really should consider getting something already unlocked that can universally work anywhere. And lots of interesting non-Sprint compatible phones like OnePlus 3t (among the others on the lists I provided) are already unlocked and have a lot of good capabilities and would work great anywhere. The Pixel is one of the best devices out there and the camera is amazing from what most people say.
So I think your options are limited and I'd highly suggest you consider getting a Pixel or something else already unlocked.
asuh said:
If anyone reading this knows better, please feel free to correct me.
This is my understanding of LTE bands and CDMA/GSM radios.
Phones like HTC 10, which are locked, include hardware that are built for specific usages. Prior to HTC 10, HTC phones built for Sprint's CDMA radio were specifically built to lock out GSM radio signals and most other LTE bands using the hardware. This means you'd have to open the physical device and modify the wiring inside the phone in order to allow other signals to work.
As of HTC 10, the locks are supposedly now just software based but I haven't seen proof of that. What this essentially means is that you should be able to unlock the bootloader and flash new Roms that could allow the GSM radio to work universally. However, lots of people are having issues with it. Here's one story of someone who was mostly successful but still had issues:
https://forum.xda-developers.com/showpost.php?p=68960210&postcount=47
Read through the thread above and you'll see a lot of people having issues trying to fully unlock the radios and LTE bands for this phone.
If you ultimately don't want to be on Sprint anyway, I think you really should consider getting something already unlocked that can universally work anywhere. And lots of interesting non-Sprint compatible phones like OnePlus 3t (among the others on the lists I provided) are already unlocked and have a lot of good capabilities and would work great anywhere. The Pixel is one of the best devices out there and the camera is amazing from what most people say.
So I think your options are limited and I'd highly suggest you consider getting a Pixel or something else already unlocked.
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They are software based. I have unlocked AT&T bands on my Sprint variant, 2 actually , and they worked perfectly fine. I would show you proof but I am back on T-Mobile which the Sprint HTC 10 already has LTE support for by default.
unlock
jblparisi said:
They are software based. I have unlocked AT&T bands on my Sprint variant, 2 actually , and they worked perfectly fine. I would show you proof but I am back on T-Mobile which the Sprint HTC 10 already has LTE support for by default.
Click to expand...
Click to collapse
how did you unlock it manualy? can you show me some instruction?
jacobtvaliashvili said:
how did you unlock it manualy? can you show me some instruction?
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Click to collapse
See my other reply.
is there any way to get volte in samsung note 3 sm-9005 by flashing official roms if yes then pls friend post the tutorial it will be very kind of you
I want volte tooo
surajyadav98 said:
is there any way to get volte in samsung note 3 sm-9005 by flashing official roms if yes then pls friend post the tutorial it will be very kind of you
Click to expand...
Click to collapse
even i want it bro. have u got any way for it
prashantxpe said:
even i want it bro. have u got any way for it
Click to expand...
Click to collapse
Learn to search its the rules .
https://forum.xda-developers.com/search/forum/2494?query=volte
***voLTE, WiFi calling, Tmobile***
=======================================
(linked from XDA by David Ruddock)
T-Mobile Unofficially Speaks To Us About Band 12 LTE / VoLTE And Unlocked Smartphones,
And Yep It's Still Confusing
-----------------------------------
Yesterday, we published an article asking an open question: what is up with T-Mobile band 12 support being removed from some unlocked smartphones?
Today, T-Mobile contacted us to speak about said article. Unfortunately, T-Mobile was unwilling to provide any official on-record responses to our questions. But after a short discussion, I can provide you some information I have learned on background (journalist speak for "cannot be directly quoted or attributed to anyone"). First:
On T-Mobile, any device on its network with band 12 LTE data support must also support T-Mobile Voice over LTE services and E911.
The E911 part isn't particularly important in terms of the certification requirement - all phones sold in America are technically E911 compliant, because by law they have to be. The problem is that E911 compliance is inextricably linked to T-Mobile's VoLTE requirement for band 12. Without VoLTE support, a device on band 12 service would be unable to make phone calls of any kind if no other T-Mobile band was available (it will not know to fall back to AT&T roaming - the call will just flat-out fail), and that would include making 911 calls, meaning the device would for legal purposes likely be out of E911 compliance, and T-Mobile could get in trouble with the FCC. Not to mention, you could have somebody trying and failing to dial 911 in an emergency, which would of course be terrible. And yes, by removing band 12 support, you can make E911 work, because the phone then has no signal at all and knows to try to roam onto another compatible network (AT&T usually) to complete the call. This is both a safety and liability issue, and it is easy to understand where T-Mobile would be coming from in terms of concern about this - they do have something of a history with E911 debacles. Clearly this is a very real safety concern, and I do sympathize with T-Mobile in the sense that they obviously can't just sit here and do nothing about it. But there are practical concerns for OEMs here - adding T-Mobile VoLTE isn't just as easy as flipping a switch.
In order to obtain VoLTE compliance for band 12, phones must go through T-Mobile's rigorous network certification process (and yes, unlocked phones can go through this certification).
Speaking off the record to one major smartphone vendor, we have learned that there are very real costs and complexities associated with obtaining that certification, and it must be done on a device-by-device basis. Many phone OEMs, then, may simply choose to remove band 12 support from their unlocked smartphones sold in America. This could mean phones like the Alcatel OneTouch Idol 3 (4.7 and 5.5), the Huawei Ascend P8 Lite, the Huawei SnapTo, OnePlus 2, Moto X Style (aka Moto X 2015 PE), Moto X Play, HTC One M9 Unlocked and Developer Edition, Saygus V2, and various imported phones (ie, some global unlocked Sony or Samsung devices) or unlocked branded AT&T phone models may lose band 12 support in future software updates. The fact is, we don't know what will happen, or to which phones, or when. Some manufacturers may choose to get T-Mobile VoLTE certification (Motorola has hinted as much with the new Moto X 2015 PE), but many may also simply choose to quietly disable band 12 for T-Mobile in software updates. Motorola, as we know, has already done this with the Moto E.
It is not clear what action, if any, T-Mobile will take if a smartphone vendor refuses to remove band 12 data support from their device and also refuses to undergo the T-Mobile VoLTE certification process. (Ie, they want to keep B12 data but not bother with B12 VoLTE certification.)
This is basically the kicker. What will T-Mobile do if a vendor says "no way" to dropping band 12 data, but also doesn't want to go through the VoLTE certification process? We don't know. They might not do anything. But they might do something. Again, this is why speaking to T-Mobile about this situation was so frustrating. Not only we were unable to directly quote or attribute any of the information we were provided, but there was also no clarity as to what would happen in the event the band 12 situation comes to a head with an OEM that refuses to "play ball."
It seems unlikely that any OEM would refuse T-Mobile's request here, though, as most of them are also partnered with the company on T-Mobile-branded devices.
We have asked T-Mobile again for an on-record statement about this entire situation, because it would help clarify it immensely. As things stand now, T-Mobile is attempting to put the ball in the court of manufacturers. Which, to be fair, manufacturers do have a role to play here - they have to make the decision to drop band 12 or go through the T-Mobile certs for these unlocked band 12 devices. Or, potentially, just ignore T-Mobile's band 12 requirements entirely and see what happens. Unfortunately, as you might guess, most smartphone OEMs have zero desire to discuss upcoming software updates in detail, or to ever put their product in a situation where it is being highlighted for losing a feature. That makes our job here a difficult one.
We will update you on any more information we receive about this situation, including any response from T-Mobile or potentially-affected device manufacturers we have reached out to.
---------------------------------------------------------
surajyadav98 said:
is there any way to get volte in samsung note 3 sm-9005 by flashing official roms if yes then pls friend post the tutorial it will be very kind of you
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Offical rom??? if your mean stock rom, yes it possible to have VoLTE, provided your network support!