Related
First time forum user looking for some answers and a bit of help so thanks in advance for anything you can provide!
I just bought a Samsung Galaxy Note 3 from WIND Mobile in Canada. The model number was SM-N900W8. It seems although carriers know the device has the required bands, they limit listing them on their website if they do not support them and go one step further by having Samsung block the bands through some type of software cripple.
My concern is I use WIND Mobile when local and Telus Mobility when in fringe areas which WIND Mobile does not cover. Prior to buying this device from WIND outright, I confirmed with Samsung live chat support this specific model from WIND will support LTE on Telus. I was told I must first activate the device on WIND and they once I unlock the device, I can configure the Telus APN settings for use on the Telus network. When I do this, I get a max speed of 3G and in the network connections, it does not show: LTE/WCDMA/GSM (auto connect) but instead, the 3 original modes which you can select when on WIND Mobile: WCDMA/GSM (auto connect), WCDMA only and GSM only.
It seems as if the unlock and APN settings are the first 2 parts but in order for LTE to work, you must disable the cripple which Samsung has implemented for it's distribution to WIND Mobile since they do not support that frequency or radio band. My concern is it looks as if this must be done through a root or flash and I hear about phones getting bricked. I paid a lot of money for the device and cannot afford to damage it so do not know what options I have.
If I do enable LTE through a flash and then get an OTA Samsung update, will this remove the flash? How must I go about getting LTE enabled permanently without issue or is this not possible? Thank you for the help!
Hi fellow Windman
just follow this easy guide http://forum.xda-developers.com/showthread.php?t=2471340
everything is self explanatory, including LTE
AllGamer said:
Hi fellow Windman
just follow this easy guide http://forum.xda-developers.com/showthread.php?t=2471340
everything is self explanatory, including LTE
Click to expand...
Click to collapse
Thank you so much. I will follow this guide word for word but is there any risk of bricking my phone like I have read so much about? The last thing I want to do is mess something up and have a paperweight.
If I root the device as suggested and receive an OTA notification from Samsung to update the software, will this lock everything again and make me go through the procedure all over again or will it be permanently enabled? Thanks!
AllGamer said:
Hi fellow Windman
just follow this easy guide http://forum.xda-developers.com/showthread.php?t=2471340
everything is self explanatory, including LTE
Click to expand...
Click to collapse
So, I rooted the device and assume it was successful since I have the SU (Super User) App installed. I ran the TWRP file which I assume is the OS which enables all the crippling Samsung initially implemented when releasing this phone to WIND Mobile but the problem still stands. I have entered all the correct APN settings for Telus yet it still only provides a 3G connection. Have I done something wrong and can any of you gurus familiar with rooting and updating a custom OS provide some insight. Thanks!
I think I'm worse than a noob. At least they can figure this stuff out! I followed the quick root steps and the twrp steps but was I supposed to do something else to enable LTE? The phone is definitely rooted and has the SU App installed. TWRP just seems like a program which allows installation of a custom ROM directly from the device but I may be wrong. My concern is the TWRP file I downloaded looks as if it's a tar file which the phone loads allowing HSPA and LTE capability. If so, it did not work on my WIND device.
You can't get the OTA if you have custom recovery installed. I.e. TWRP or CWM. You gotta wait for custom roms. I don't know about the lte thing
Sent from my Nexus 4 using XDA Premium 4 mobile app
cellrama said:
I think I'm worse than a noob. At least they can figure this stuff out! I followed the quick root steps and the twrp steps but was I supposed to do something else to enable LTE? The phone is definitely rooted and has the SU App installed. TWRP just seems like a program which allows installation of a custom ROM directly from the device but I may be wrong. My concern is the TWRP file I downloaded looks as if it's a tar file which the phone loads allowing HSPA and LTE capability. If so, it did not work on my WIND device.
Click to expand...
Click to collapse
yea you're totally wrong here man... not sure how to enable lte capability, but wind's network is hspa+ already so that's enabled.
i do know you have to unlock it, likely with a sim unlock code or getting someone to unlock it, but after that, the theory is, that it should work.....
WIND is 4G and I have unlocked the device already. I am using a Telus SIM card and have correctly entered the Telus APN settings for LTE but it does not show LTE as a network mode which I can select. Seems to me Samsung has crippled this band since WIND does not support it. Since I have rooted the device, which I probably didn't need to do, I was hoping to find a flash which will permanently enable the LTE so it will function on Telus.
To use Telus LTE you need to switch to the Telus SIM card
then it should read the Telus APN from it, if not you can enter the Telus LTE APN and it should use it
AllGamer said:
To use Telus LTE you need to switch to the Telus SIM card
then it should read the Telus APN from it, if not you can enter the Telus LTE APN and it should use it
Click to expand...
Click to collapse
I have done this already. The steps followed to date are as follows:
Purchased my WIND Mobile Galaxy Note 3 (model: SM-N900W8)
Unlocked the device through cellunlocker.net for 32.99 USD
Placed my Telus SIM into the device and it read the details. I was able to call and text without issue but did not have data connectivity. Contacted Telus and received the Telus LTE APN details and entered this information. Unfortunately, the network mode only shows 3 options: WCDMA/GSM (auto-connect), WCDMA only and GSM only.
There should be a fourth option for LTE capability but this is not displaying. I rooted my device and followed the TWRP step thinking this TWRP file was the rom to enable the LTE capability which seems to be locked but this is not the case. I am way off here but know it's probably something simple which I am missing!
yes, the 4th option for the LTE needs to flash another modem
i got it working here http://forum.xda-developers.com/showpost.php?p=46259468&postcount=39
find any of the Note 3 threads with flash-able modems, and flash the one from Puerto Rico that enables the LTE
AllGamer said:
yes, the 4th option for the LTE needs to flash another modem
i got it working here http://forum.xda-developers.com/showpost.php?p=46259468&postcount=39
find any of the Note 3 threads with flash-able modems, and flash the one from Puerto Rico that enables the LTE
Click to expand...
Click to collapse
To confirm your above statement, am I going to the following page and downloading the firmware for Puerto Rico?
http://www.samsungis.com/Firmwares/SM-N900W8.html
or must I locate a thread to download just modem firmware and then follow the same ODIN instructions as I did with the other files?
Thanks!
cellrama said:
To confirm your above statement, am I going to the following page and downloading the firmware for Puerto Rico?
http://www.samsungis.com/Firmwares/SM-N900W8.html
or must I locate a thread to download just modem firmware and then follow the same ODIN instructions as I did with the other files?
Thanks!
Click to expand...
Click to collapse
you only need the modem, you don't need to flash an entire ROM.
there was a reference topic with a list of downloads for all different modems for the Note 3 in the General section of this Note 3 portion of the forum. http://forum.xda-developers.com/showthread.php?t=2475714
they are still uploading all the different models, you you might want to wait a bit, or you can extract it on your own, if you know how to do that from an odin .tar file.
AllGamer said:
you only need the modem, you don't need to flash an entire ROM.
there was a reference topic with a list of downloads for all different modems for the Note 3 in the General section of this Note 3 portion of the forum. http://forum.xda-developers.com/showthread.php?t=2475714
they are still uploading all the different models, you you might want to wait a bit, or you can extract it on your own, if you know how to do that from an odin .tar file.
Click to expand...
Click to collapse
Following the link you provided, it indicates the modem for model SM-N900W8 is "coming soon..." so it does not look like a modem is available for my model at this time. I tried looking for the Puerto Rico modem flash which you used but I do not see reference to it.
I was going to install the SM-N900W8 ROM for telus which would have the modem but as research indicates, if you install the wrong carrier ROM, you brick your device. I may have misinterpreted this but the last thing I wish to do is brick my device and have an expensive paper-weight in the end. Thanks again!
cellrama said:
I was going to install the SM-N900W8 ROM for telus which would have the modem but as research indicates, if you install the wrong carrier ROM, you brick your device. I may have misinterpreted this but the last thing I wish to do is brick my device and have an expensive paper-weight in the end. Thanks again!
Click to expand...
Click to collapse
the Puerto Rico ROM is safe to flash
actually anything that is for the SM-N900W8 are safe to flash
AllGamer said:
the Puerto Rico ROM is safe to flash
actually anything that is for the SM-N900W8 are safe to flash
Click to expand...
Click to collapse
So I just got my phone unlocked with cellunlocker.net code, threw in a bell SIM and rebooted etc, it worked and was pretty quick but nothing too incredible. Was getting top download speeds of about 750kb/s (or 6mbps) whereas on wind I'd get about half that tops in my current location. My question here is, the phone said 3g....to me that seems way too fast for 3g but not nearly right for lte and I also couldn't see lte as an option for the bands. I assume that's cuz I still had the wind modem on the phone? Even when I went into the *#2263# screen to enable lte it still didn't work....
Any ideas? Should I flash the Puerto Rico Rom? Does it still work on wind bit just also let you use the lte radios when the correct SIM is in?
cellrama said:
Unlocked the device through cellunlocker.net for 32.99 USD
Click to expand...
Click to collapse
asaqwert said:
So I just got my phone unlocked with cellunlocker.net code ...
Click to expand...
Click to collapse
How long did it take to get your unlock code with cellunlocker.net? Which device did you pick in the dropdown?
I got a quote for 14.99 but guessing you have to pay more for a secondary search later?
UPDATE:
Never mind just got the code and it worked Cost me 14.99.
Hi did you manage to enable the LTE bands on your phone. I am on the same boat, have a WIND note 3 and I would like to do the same.
Thank you
fidos said:
Hi did you manage to enable the LTE bands on your phone. I am on the same boat, have a WIND note 3 and I would like to do the same.
Thank you
Click to expand...
Click to collapse
I'm really new to this but hopefully this will clarify some info regarding WIND and please correct me should I be wrong. There are two things when working with a phone. Customization to the OS and proper data connection. If you wish to tweak your device, push it to the limits and customize your OS settings, you can root your device.
If you wish to just enable LTE so you can use it on an LTE capable network like Telus, Bell or Rogers in Canada, you must flash the proper modem file to enable LTE. As I understand, the Puerto Rico Modem Flash will allow you to enable LTE data on the WIND Mobile variant of the Note 3. You can get the Puerto Rico Modem Flash from Post #27 by AllGamer at the following link:
http://forum.xda-developers.com/showthread.php?t=2475714&page=3
I think this is safe but I'm waiting for clarification from AllGamer regarding what is meant by their statement "NOT for flashing!". Once confirmed, I'll update this post but if this works, I feel they should be thanked by clicking on the thank you button and a donation should be made for what you feel this information is worth and obviously, what you can afford. Without individuals like this, we would be at a stand still for modifications!
THANK YOU ALLGAMER FOR YOUR UNSELFISH DEMEANOR ON THE FORUM!
cellrama said:
I'm really new to this but hopefully this will clarify some info regarding WIND and please correct me should I be wrong. There are two things when working with a phone. Customization to the OS and proper data connection. If you wish to tweak your device, push it to the limits and customize your OS settings, you can root your device.
If you wish to just enable LTE so you can use it on an LTE capable network like Telus, Bell or Rogers in Canada, you must flash the proper modem file to enable LTE. As I understand, the Puerto Rico Modem Flash will allow you to enable LTE data on the WIND Mobile variant of the Note 3. You can get the Puerto Rico Modem Flash from Post #27 by AllGamer at the following link:
http://forum.xda-developers.com/showthread.php?t=2475714&page=3
I think this is safe but I'm waiting for clarification from AllGamer regarding what is meant by their statement "NOT for flashing!". Once confirmed, I'll update this post but if this works, I feel they should be thanked by clicking on the thank you button and a donation should be made for what you feel this information is worth and obviously, what you can afford. Without individuals like this, we would be at a stand still for modifications!
THANK YOU ALLGAMER FOR YOUR UNSELFISH DEMEANOR ON THE FORUM!
Click to expand...
Click to collapse
Thank you for your reply. I am not sure why everything sounds so complicated.
I was able to flash a small file to my S4 (rogers) to enable the WIND bands. The phone did not need to be rooted, ODIN worked like a charm and my S4 became pentaband
This ordeal with the note 3 is not as straight forward. I have been following all your post but I see that you have not received any straight forward answers to your questions. I am not an expert when it comes to rooting or flashing so I would love a simple way of doing this.
Thank you again, lets hope that we will find an easy way to do this
Hi guys, really hoping you can help me out here.
I have a n900v and i have a tmobile sim in it (metroPCS, but same thing now). I've seen several threads here saying guys put in their metro or tmobile sim and voice/text worked right off the bat. The same is not true for me. I have put in my sim and tried several different tmobile APN settings (ones specifically for the Note 3 on tmobile, and then the one my S3 currently uses) and nothing works. I looked for a tmobile note 3 radio to flash thinking that would work but i dont even see a radios thread in the n900t forums. I even flashed the hyperdrive rom hoping that would open me up.
Can anyone tell me how to get this phone on the tmobile network?
JenovaImproved said:
Hi guys, really hoping you can help me out here.
I have a n900v and i have a tmobile sim in it (metroPCS, but same thing now). I've seen several threads here saying guys put in their metro or tmobile sim and voice/text worked right off the bat. The same is not true for me. I have put in my sim and tried several different tmobile APN settings (ones specifically for the Note 3 on tmobile, and then the one my S3 currently uses) and nothing works. I looked for a tmobile note 3 radio to flash thinking that would work but i dont even see a radios thread in the n900t forums. I even flashed the hyperdrive rom hoping that would open me up.
Can anyone tell me how to get this phone on the tmobile network?
Click to expand...
Click to collapse
pretty sure u would have to get metro to first add the IMEI to their database before the sim could work
s3xda said:
pretty sure u would have to get metro to first add the IMEI to their database before the sim could work
Click to expand...
Click to collapse
I just called and gave them the IMEI to add to the DB, they said it wasnt listed in their inventory and may need to be unlocked. But i dont get a sim unlock prompt on the phone and every post says these come unlocked.. I have a feeling it's the radio that i need. Does anyone have a recovery or odin flashable tmobile modem?
Tmobile rom didnt fix either
Just safestrapped a stock tmobile rom and it didnt help. Guess it didnt include the modem. I need to find some firmware to extract it from.
JenovaImproved said:
Just safestrapped a stock tmobile rom and it didnt help. Guess it didnt include the modem. I need to find some firmware to extract it from.
Click to expand...
Click to collapse
There are some threads in dev i believe that are flashable modems
Before I rooted my verizon galaxy s5 I was able to use ATT sim cards but the phone would not get any service whatsoever with a tmobile sim or metro pcs sim. Everyone i spoke to at least was able to connect to the tmobile or metro pcs network, even if they were having data issues...but I was not even able to get a network signal. Finally, I rooted the phone and am using a tmobile rom thinking that may help. But no luck. For some reason my phone will not register itself on tmobile or metro pcs, Not even to just connecto to the network to make phone calls. I tried 2 different tomible roms and i think an att rom and no luck whatsoever. Anybody else experience this issue? Is there a root function or service menu that I need to access to enable the proper band? Is rooting the phone even going to change anything? Makes no sense how every other verizon s5 out there has no problem connecting to tmobile or metro but I have the only one. Ive scoured the forums and have yet to find any answer....thoughts? Oh, I also tried every APN settings combination imaginable. Even other carriers just because I was getting nowhere with the tmobile and metro APNs.
Quite a lot of your thread made absolutely no sense, so I'm not sure if this will help.
Look for a tar.md5 that contains the stock modem partition for the Verizon S5, and flash it through Odin.
Are you bootloader unlocked? I would just flash a generic klte rom, like Cyanogenmod, instead of flashing an ATT or T-Mobile rom.
camcorder123 said:
Quite a lot of your thread made absolutely no sense, so I'm not sure if this will help.
Look for a tar.md5 that contains the stock modem partition for the Verizon S5, and flash it through Odin.
Are you bootloader unlocked? I would just flash a generic klte rom, like Cyanogenmod, instead of flashing an ATT or T-Mobile rom.
Click to expand...
Click to collapse
According to a few people i spoke with the root for verizon s5 can only accept TW roms. And to clear up anything that doesnt make sense. my verizon s5 will not get any service with tmobile or metro. Works fine with att. So i decided to root. After rooting still no luck. However, before I rooted I was getting no bars at all. After rooting I was actually getting service bars but still would not get any actual service. I tried every APN setting I could find and still no luck. Thats all. I will try your advice as far as flashing the tar.md5 and let you know.
leronlb33 said:
According to a few people i spoke with the root for verizon s5 can only accept TW roms. And to clear up anything that doesnt make sense. my verizon s5 will not get any service with tmobile or metro. Works fine with att. So i decided to root. After rooting still no luck. However, before I rooted I was getting no bars at all. After rooting I was actually getting service bars but still would not get any actual service. I tried every APN setting I could find and still no luck. Thats all. I will try your advice as far as flashing the tar.md5 and let you know.
Click to expand...
Click to collapse
There was a bootloader unlock exploit released - it allows any rom to be flashed. It's been in the top development posts for weeks. Go check that out, and you can flash cyanogenmod.
I actually am in a similiar situation except I am already on CM13 using a previously Verizon S5, I just started Tmobile service yesterday and in general I can make calls but data is rather inconsistent. Example right now when I make it call it falls down to 3g (Normal) but when I disconnect it tries to connect to H+ then 3G but all of them don't supply it data so it just swaps around 3G LTE and H+ and I have to airplane mode on/off to fix it. So this person may still have issues using CM13. I did already go over the APN information with people from TMobile and from post around the web. Does anyone think that flashing the Tmobile s5 modem stuff will fix this?
you just need to get the correct APN settings
buschris said:
you just need to get the correct APN settings
Click to expand...
Click to collapse
I've tried the correct son settings. It didn't work. I used the settings found online for T-Mobile. I called T-Mobile. Non of the settings worked. I flashed back the the stock rom. No joy. flashed a verizon s5 rom again. No joy. I am starting to think that this is the only verizon s5 that won't allow t to register on T-Mobile's network.
Hello everyone so this my history I'm on T-Mobile Network and I have a Verizon v20 unlock phone everything working good just the internet is slowly so I searched about how to enable bands (I can't find something clear ) on Verizon v20 to make it work on TMobile (full LTE ) its this possible ? Is there some mode or something the really work (Unlock bands) like I said already searched but I can't find something really clear
Note : I have just H sign allway on like other user experiment jus show 4g lte for a minute
Thanks on advance
If I understand you correctly, perhaps you need to set up an APN for T-Mobile. It'll be under Settings->Networks->More->Mobile Networks->AccessPoint Names.
SMTB1963 said:
If I understand you correctly, perhaps you need to set up an APN for T-Mobile. It'll be under Settings->Networks->More->Mobile Networks->AccessPoint Names.
Click to expand...
Click to collapse
Well I already have the TMobile APN and I trying to figure how to get lte because I have only H icon and no Lte (speed) so what the asking is if is possible activide TMobile band like 7 , 12 etc ... Thanks for your reply ?
Well, you came from Verizon CDMA and T-Mobile is GSM. As long as you've got the proper values in the T-Mobile APN (and you got your sim from T-Mobile), I'm not aware of anything else you can do. Could be wrong, though.
Good Luck!
SMTB1963 said:
Well, you came from Verizon CDMA and T-Mobile is GSM. As long as you've got the proper values in the T-Mobile APN (and you got your sim from T-Mobile), I'm not aware of anything else you can do. Could be wrong, though.
Good Luck!
Click to expand...
Click to collapse
Thanks I'll keeping searching if I find something I'll post here but if someone have a information about how to making work (unlock frequency's band ) more than welcome ?
The ONLY way I could is to flash another carrier or us996 custom rom. The vs995 rom apparently forces the phone to connect to Verizon towers and bands only. Can't edit in any secret menus, nothing, that's the only way I could. Tip, if you want to use wifi calling, flash a custom stock TMobile room not us996
Interesting so there is a way to flash us996 (Spring correct ?) rom on V995 ? Anyone know what's the safe way if is possible ? ?
Gabe2014 said:
Interesting so there is a way to flash us996 (Spring correct ?) rom on V995 ? Anyone know what's the safe way if is possible ? ?
Click to expand...
Click to collapse
I have same situation but with AT&T , please let me know if you find how to fix it
jamam5 said:
I have same situation but with AT&T , please let me know if you find how to fix it
Click to expand...
Click to collapse
I still looking if is possible to fix it , I let you know if I find something
Smitty13 said:
flash a custom stock TMobile room not us996
Click to expand...
Click to collapse
Flashing a tmobile rom on a nontmobile phone is a great way to brick. Best case it won't boot and lets you flash back, though it could trip ARB as well making it impossible to roll back. The kernel uses a different security key than the other models.
Has anyone tried flashing a Non.Hlos.Bin from which-ever carrier you are wanting to use?
I don't own this phone, I just by chance took a look at this thread.
Yes of course you would need the correct APN. But you may also may need to flash the modem file from the carrier you are wanting to use. ( It can be extracted)
Another option is using QPST.
With QPST you can change the IMEI, add bands, repair a bricked phone, flash a rom etc. These are just suggestions for things to try. Again, I do not have this phone.
Old thread I know, but if you or others have this problem, have you tried using the LG hidden menu (accessed using dial screen)?
*#546368#*996#
If you have the 996 version, just copy & paste. Otherwise, just change 996 to what model you have.
Field Test > Modem Settings > LTE Band Selection
Select the band you want to use/test, then wait a few seconds for it to register. Your signal will drop for a moment, then should show 4GLTE, if you selected the correct one. There may be more than one that works, but one may be more congested.
You should find a list of available bands for your carrier, before messing around.
Also, do not mess with other settings, or you could really screw up your phone I know from experience.
Hey guys, I could use a little help here. I've done some firmware flashing on phones years ago, so I'm not a total noob, just haven't needed to in a long time.
Anyway, I recently picked up an unlocked Sprint S7 edge (was a really good deal) and I'm trying to use it with Metro now. The issue is this. If I set the network to GSM mode, I can make phone calls just fine, but data is totally not functioning. If I switch it to LTE/CDMA mode, the data works beautifully, but I can't make or receive any phone calls. It just instantly hangs up if I try to dial out or goes to voicemail if someone calls me.
I've activated the IMEI with my carrier and verified that the phone is indeed unlocked. I'm guessing this is just some annoying Sprint bug put in there to make the phone not work right on other providers. Any ideas what needs to be done? Do I need to run a third-party ROM, flash a different modem to it? Something else?
I really appreciate any tips here.
What firmware is the phone running?
lvpre said:
What firmware is the phone running?
Click to expand...
Click to collapse
Hi Ivpre,
Thanks for responding. The phone is running Software version G935PVPU6BRD2, baseband version G935PVPU6BRD2, it's HW revision 7.0 and Android 7.0. Kernel version is 3.18.31-12623509.
I've tried using a few SM-G935U ROMs but they all have failed so far and left the phone in a boot loop. Only by reflashing a Sprint ROM am I able to successfully flash it.
I assume I'm just not selecting or finding a ROM that the same or newer version, as I've read about the downgrade issues with the bootloader. Any idea how to match one? I'd be fine with pretty much any ATT/T-Mobile/Metro ROM since that should fix my issue for the time being. A factory unlocked ROM would be nice though.
I have a T-Mobile Sim (same network Metro uses) in my unlocked Sprint S7 Edge. Network mode is set to Automatic and everything works fine.
Did you Add the APN for T-Mobile? I had to add the T-Mobile APN https://support.t-mobile.com/docs/DOC-28006
And the ALSO add a second APN named internet, with no other values changed. The 2nd one is the one selected, not sure why, but it works that way.
I would like to flash a T-Mobile Rom or the U Rom but they are on Baseband 4, which will not work since our phones are now on Baseband 6(5th number from the right in the firmware version.)
Did you try changing the APN settings?
gullzway said:
I have a T-Mobile Sim (same network Metro uses) in my unlocked Sprint S7 Edge. Network mode is set to Automatic and everything works fine.
Did you Add the APN for T-Mobile? I had to add the T-Mobile APN https://support.t-mobile.com/docs/DOC-28006
And the ALSO add a second APN named internet, with no other values changed. The 2nd one is the one selected, not sure why, but it works that way.
I would like to flash a T-Mobile Rom or the U Rom but they are on Baseband 4, which will not work since our phones are now on Baseband 6(5th number from the right in the firmware version.)
Click to expand...
Click to collapse
So you are using the Sprint firmware on T-Mobile? Everything works well? I'm thinking of jumping to cricket this summer, but one phone is stuck on b5 (the other is still rocking 4), so I was a little worried. So basically you just put in the SIM card and added the APN's?
lvpre said:
So you are using the Sprint firmware on T-Mobile? Everything works well? I'm thinking of jumping to cricket this summer, but one phone is stuck on b5 (the other is still rocking 4), so I was a little worried. So basically you just put in the SIM card and added the APN's?
Click to expand...
Click to collapse
Yes it was working fine with a T-Mobile Sim card and edited APN's. It is now back on Sprint because T-Mobile coverage is poor/non existent inside my work. I will be porting one of my SERO lines to T-Mobile but keeping one with Sprint. T-Mobile only uses Band 2 and 4 where I live, If you live somewhere that has band 12, it may not be unlocked in the Sprint Firmware.