Database Users

VoLTE on T-Mobile USA

One of my friends came from overseas a few months ago with VoLTE working on Tmobile US. At least I thought it was.
I did not think much of it at the time, but now that I have my own Z5, and can't get it to work, I'm curious.
Is there any special APN settings needed for VoLTE on TmoUS?
WHen i received my Z5, I noticed there was not any option for VoLTE. I went ahead and flashed the a singapore rom and it is here now but still cannot get it to work. I will try different settings and update.
I am also going to go through a few more roms to see if they work out of the box with it.
WIll it not ever work unlesss TmoUS certifies this device specifically? I don't think that is the case.

It's carrrier dependant

VoLTE uses the SIP protocol for communication. Aside of the implementation of the handling of such calls you would need the necessary data for registering at the server including the server's address, username and password.

I bought my international version from Amazon and turns out it is a Taiwanese version.
I can turn volte on or off but I can't tell it is working or not cause I don't know how to test it.

Testing it is pretty straightforward. Make sure you're on a 4G (LTE) network and place a phone call. Watch to see if you're signal changes to something other than where it started.
My experience is that I have 4G (LTE) in fewer places than 3G, as 4G seems to be less awesome at penetrating thick buildings. So, I don't see what the advantage/concern of VoLTE working or not is. But, I'm happy to learn.

Yakkosmurf said:
Testing it is pretty straightforward. Make sure you're on a 4G (LTE) network and place a phone call. Watch to see if you're signal changes to something other than where it started.
My experience is that I have 4G (LTE) in fewer places than 3G, as 4G seems to be less awesome at penetrating thick buildings. So, I don't see what the advantage/concern of VoLTE working or not is. But, I'm happy to learn.
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When I make a call, the icon switch from 4G into 3G and H+ (back and forth between the two).
Does it mean no VoLte?

misbehave said:
When I make a call, the icon switch from 4G into 3G and H+ (back and forth between the two).
Does it mean no VoLte?
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I have the same question too.

That's my understanding of the problem. With my AT&T iPhone, it stays reading LTE when I place calls.

If you see switching from LTE to another network upon dialing or receiving a call and going back to LTE once hung up it's a very strong indication that VoLTE does not work.

andiling said:
If you see switching from LTE to another network upon dialing or receiving a call and going back to LTE once hung up it's a very strong indication that VoLTE does not work.
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THat is correct. My phone switches from 4G to H+ when on a phone call...
After many hours with t-mobile, and also at work, i was informed that t-mobiles VoLTE is proprietary and only tmoUS branded devices are usually the ones to get VoLTE to work with them.
Maybe in the future that will change, they said. oh well.

Until now every provider's solution is proprietary as the 3gpp standard is not finalized yet. So we need to be patient...

Verizon users, lend me your ears!

I started out with USCC on this device. But last week I switched ourn lines over to big red. I noticed that big red forces you to use LTE, with no options under "cellular networks" to select CDMA. Here in Maine, LTE drains your battery 50% faster than CDMA, and data is wonky. It tends to be slower than CDMA, or at least feels slower because it is constantly switching between the 2 or hanging in limbo.
My phone was set to CDMA on USCC, and even after switching to Verizon, I'm still on CDMA. My question is, if I return to stock LP will it force me into LTE -with no choice of switching back to CDMA? So far, Marshmallow has been a huge disappointment on my phone.

HikingMoose said:
I started out with USCC on this device. But last week I switched ourn lines over to big red. I noticed that big red forces you to use LTE, with no options under "cellular networks" to select CDMA. Here in Maine, LTE drains your battery 50% faster than CDMA, and data is wonky. It tends to be slower than CDMA, or at least feels slower because it is constantly switching between the 2 or hanging in limbo.
My phone was set to CDMA on USCC, and even after switching to Verizon, I'm still on CDMA. My question is, if I return to stock LP will it force me into LTE -with no choice of switching back to CDMA? So far, Marshmallow has been a huge disappointment on my phone.
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Just go into hidden menu via dialer and force your phone into CDMA or LTE or whatever you want. It's simple really and will give you what you want.

Well, is there a "new to Verizon" guide somewhere? Verizon didn't tell me about the secret codes. I don't even know how to do an advanced prl update.

I should have clarified that I've only ever been on USCC. I've never used Verizon. But I do vaguely remember reading about a hidden dialer code now that you mention it. I'll look into that.

HikingMoose said:
Well, is there a "new to Verizon" guide somewhere? Verizon didn't tell me about the secret codes. I don't even know how to do an advanced prl update.
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This is android secret code not Verizon.
*#*#4636#*#*

Thanks. Never needed it because us cellular already offers that.

HikingMoose said:
Thanks. Never needed it because us cellular already offers that.
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It's not a that they don't offer that 99% of the time you are better off on LTE so its good that phones prefer LTE. Most likely your other phone simply had that option not hidden unlike on Moto. So that wasn't a ussc feature
Sent from my XT1575 using Tapatalk

Agree to disagree. The data speeds are about the same here, but with the constant handoffs, LTE actually becomes slower and pages won't load because it's switching to 3G and back to LTE over, and over, and over. Plus the added battery drain off having 15-20dBm weaker signal, it's a no brainer. But maybe that's just in our less developed state.
The Samsung phone that I bought for my wife has no CDMA provisions, so it's not a Moto thing, it's a Verizon thing.

You can also download the thunder bolt lte on/off app and you have choices like CDMA auto prl. I use it to force CDMA only on my range extender at home.

Use shortcut creator to link to the hidden menu and your all set

HikingMoose said:
Agree to disagree. The data speeds are about the same here, but with the constant handoffs, LTE actually becomes slower and pages won't load because it's switching to 3G and back to LTE over, and over, and over. Plus the added battery drain off having 15-20dBm weaker signal, it's a no brainer. But maybe that's just in our less developed state.
The Samsung phone that I bought for my wife has no CDMA provisions, so it's not a Moto thing, it's a Verizon thing.
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This device doesn't run Verizon branded firmware at all. It's how Motorola provisioned the device to work. Like patt2k said you can change that via the hidden menu and you should be good to go, it won't look for LTE after that.

Oaklands said:
You can also download the thunder bolt lte on/off app and you have choices like CDMA auto prl. I use it to force CDMA only on my range extender at home.
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There seem to be many LTE on/off utilities in the App store. How did you pick this one?
I also have a Verizon Network Extender at home. I have trouble getting connected to it. I often have to reboot or turn the radio on/off to get my phone to connect to the Extender. I would appreciate any advice on how to get my phone to connect to the Extender more reliably.
It would also be nice if the phone would show via an Icon or screen that it is connected to the Extender. Right now the only way to know is to dial #48
EDIT: When I go into the Hidden Menu and select CDMA only, the phone temporary drops the LTE signal. However, LTE seems to quickly come back. Any suggestions on how to turn off LTE when I am home so that I force a connection to the Network Extender?

I can't get the hidden menu to switch from CDMA to LTE. It will switch temporarily, then drop the radio altogether forcing me to restart. Upon restart it's in CDMA only again. Personally, I'm fine without LTE. But I'm not sure why I can't get it enabled at all. I'd like to know I COULD have LTE if I wanted it. So I'm confused why it's stuck in CDMA

swieder711 said:
There seem to be many LTE on/off utilities in the App store. How did you pick this one?
I also have a Verizon Network Extender at home. I have trouble getting connected to it. I often have to reboot or turn the radio on/off to get my phone to connect to the Extender. I would appreciate any advice on how to get my phone to connect to the Extender more reliably.
It would also be nice if the phone would show via an Icon or screen that it is connected to the Extender. Right now the only way to know is to dial #48
EDIT: When I go into the Hidden Menu and select CDMA only, the phone temporary drops the LTE signal. However, LTE seems to quickly come back. Any suggestions on how to turn off LTE when I am home so that I force a connection to the Network Extender?
Click to expand...
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It worked with other Motorola devices in the past. CDMA only will fix your network extender issues.
You will have to set it back when you leave the house. Also it will go back to the default settings if you reboot. Works great for me.

VoLTE Verizon Nexus 6p

I don't know if this is an issue with my device, but VoLTE doesn't work if the phone loses connection for a few minutes(15-20). I tried flipping the flag and once the connection did reset and VoLTE started working again. Tried re-flashing the radio and nothing worked till now.

I live in a garbage reception area so turn off enhanced 4g LTE and have better call quality as it doesn't try to do HD voice.
But, to you're question, you mean after you resume a data connection that VOLTE takes a while to start working?

farfromovin said:
I live in a garbage reception area so turn off enhanced 4g LTE and have better call quality as it doesn't try to do HD voice.
But, to you're question, you mean after you resume a data connection that VOLTE takes a while to start working?
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The VoLTE doesn't work no matter how long I get back the service. I have to manually reset network settings to reboot for it to work. Do you know where I can file a bug for this?

Emergency calls only/LTE data, or voice and limited to 3G data? Sprint

I had my phone running PureNexus(7.1.2?) on Cricket with no issues, a couple days ago at the same time as switching to Sprint, I decided to update my ROM, went with a 8.1 ROM. When I did this, I had issues getting any sort of signal to work right, so I figured it was something with the custom ROM, grabbed the latest stock and reflashed. I then went through the same thing many others have here, but when I go back to the custom 8.1 ROM, I do not get LTE to connect, just 3G. Even erasing modemst1 and 2, it does not connect to LTE. So, ignoring that, I still backed up the EFS and restored it over the stock ROM. Doing this, I'm able to get 3G and voice to connect, but when I go into the phone menu(*#*#4636*#*#) and turn the radio off then back on, eventually it will connect to LTE. But in doing so, it puts the phone in 'emergency calls only' for voice. Currently it shows
Voice Service: In Service
Data Service: Connected
Voice Network Type: 1xRTT
Data Network Type: eHRPD
And if I go into the menu and toggle the Mobile Radio Power, it will change to:
Voice Service: Emergency Calls Only
Data Service: Connected
Voice Network Type: Unknown
Data Network Type: LTE
Once it goes to LTE, it does not go back to voice/3G even on reboot unless I erase the modem or restore an EFS backup. I've been able to replicate this 3 times now in 3 different 7.1.2 ROMs, anything 8.1 I've only been able to get 3G working. In 7.1.2 I am able to run the update device configuration, and update PRL. Both work successfully, but it still does the same thing. At this point, I know that the hardware works, as both do work fine, just not at the same time. LTE and voice does still work fine on Cricket, I put in another active SIM and both work as expected. Anyone know what else I could try?
Sorry if this is rambling, I actually had a much more detailed post then somehow refreshed my screen and lost it all

I'm essentially having the same issue with my Moto g5 plus on Verizon. Read my post!

I am having a similar issue on Sprint as well. For a little while I couldn't get 8.1 ROMs to connect to data at all, after serial flashing a bunch of them I ended up with data again accross all ROMs but now I only have LTE, it does not switch to 3 g ever, only 1x when making phone calls. I wish I knew which ROMs I flashed to get to this point but I can't remember anymore. Good luck.

emraith said:
I had my phone running PureNexus(7.1.2?) on Cricket with no issues, a couple days ago at the same time as switching to Sprint, I decided to update my ROM, went with a 8.1 ROM. When I did this, I had issues getting any sort of signal to work right, so I figured it was something with the custom ROM, grabbed the latest stock and reflashed. I then went through the same thing many others have here, but when I go back to the custom 8.1 ROM, I do not get LTE to connect, just 3G. Even erasing modemst1 and 2, it does not connect to LTE. So, ignoring that, I still backed up the EFS and restored it over the stock ROM. Doing this, I'm able to get 3G and voice to connect, but when I go into the phone menu(*#*#4636*#*#) and turn the radio off then back on, eventually it will connect to LTE. But in doing so, it puts the phone in 'emergency calls only' for voice. Currently it shows
Voice Service: In Service
Data Service: Connected
Voice Network Type: 1xRTT
Data Network Type: eHRPD
And if I go into the menu and toggle the Mobile Radio Power, it will change to:
Voice Service: Emergency Calls Only
Data Service: Connected
Voice Network Type: Unknown
Data Network Type: LTE
Once it goes to LTE, it does not go back to voice/3G even on reboot unless I erase the modem or restore an EFS backup. I've been able to replicate this 3 times now in 3 different 7.1.2 ROMs, anything 8.1 I've only been able to get 3G working. In 7.1.2 I am able to run the update device configuration, and update PRL. Both work successfully, but it still does the same thing. At this point, I know that the hardware works, as both do work fine, just not at the same time. LTE and voice does still work fine on Cricket, I put in another active SIM and both work as expected. Anyone know what else I could try?
Sorry if this is rambling, I actually had a much more detailed post then somehow refreshed my screen and lost it all
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Click to collapse
Your problem is really simular to mine, but I have an axon 7 and the service is Total wireless (verizon). I can get data and calls are emergency only. Its very odd, the other odd thing is I have 2 axon 7 (got a replacement). The one with the problem has everything working and the kicker is I restored this replacement to match the working one. So why It cant connect is really odd.

madhits45 said:
Your problem is really simular to mine, but I have an axon 7 and the service is Total wireless (verizon). I can get data and calls are emergency only. Its very odd, the other odd thing is I have 2 axon 7 (got a replacement). The one with the problem has everything working and the kicker is I restored this replacement to match the working one. So why It cant connect is really odd.
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How is this similar? You are trying to use an Axon 7 on Verizon's network... How do you expect that to work? The Axon 7 doesn't have a CDMA radio.

acejavelin said:
How is this similar? You are trying to use an Axon 7 on Verizon's network... How do you expect that to work? The Axon 7 doesn't have a CDMA radio.
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Yes it does have CDMA. Its just not officially supported by verizon. I found out that my modem partition I believe EFS was messed up and that contributed to the emergency calls only issue. I never got it fixed even through multiple re-flashes so I simply sent it back to ZTE.

madhits45 said:
Yes it does have CDMA. Its just not officially supported by verizon. I found out that my modem partition I believe EFS was messed up and that contributed to the emergency calls only issue. I never got it fixed even through multiple re-flashes so I simply sent it back to ZTE.
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I stand corrected... I assume you have seen this, especially post #3?

acejavelin said:
I stand corrected... I assume you have seen this, especially post #3?
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I have read that thanks for pointing it out. I actually could offer a correction to what he says because you can get VoLTE on the axon7 with verizon but its tricky. I had to activate the phone on an HD voice 1.0 phone iphone 6 or newer and prob other models. I have total wireless (verizon Mvno) once I do that I can swap the sim and get VoLTE on the axon7 through turning it on in test mode. Ive had volte working for a while now. I believe verizon just thinks Im on the iphone6. and I dont know what would happen if I took the iphone 6 and tried to use it on another verizon account as my service is prob tied to its IMEI.

Data gone when call comes.

I'm on latest ROS MIUI and while playing game of streaming YouTube if I get a call my Data is disabled. Please help. Thanks

!!!!!!!Root2!!!!!! said:
I'm on latest ROS MIUI and while playing game of streaming YouTube if I get a call my Data is disabled. Please help. Thanks
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Your explanation is not clear. It looks like some words are arranged randomly, to form a sentence. Try being more clearer. Otherwise no one will be able to help you.
Sent from my lavender using XDA Labs

ssaikia3 said:
Your explanation is not clear. It looks like some words are arranged randomly, to form a sentence. Try being more clearer. Otherwise no one will be able to help you.
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Okay I'll explain you the situation.
I play clash of clans and it works on internet connection. Yesterday I was playing it and my mom called on my phone. I didn't pick I just pushed up the call notification. I started getting weak signal message in game and my connection was lost.
After that I received a call again then I put call on speaker and turn on Data to use WhatsApp. When I send message it doesn't go. I think my internet connection stops when call is going on. Is it clear now? Sorry my Ingles is bad.

!!!!!!!Root2!!!!!! said:
Okay I'll explain you the situation.
I play clash of clans and it works on internet connection. Yesterday I was playing it and my mom called on my phone. I didn't pick I just pushed up the call notification. I started getting weak signal message in game and my connection was lost.
After that I received a call again then I put call on speaker and turn on Data to use WhatsApp. When I send message it doesn't go. I think my internet connection stops when call is going on. Is it clear now? Sorry my Ingles is bad.
Click to expand...
Click to collapse
Yes it's lot more clear now. And about your issue, could it be a solution to use the "data during calls" toggle under your sim settings? Honestly, I don't know much about it, as I never have faced the scenario you just described. Anyway, if this doesn't help, I hope someone with a better idea will answer you. Good luck!
Sent from my lavender using XDA Labs

ssaikia3 said:
Yes it's lot more clear now. And about your issue, could it be a solution to use the "data during calls" toggle under your sim settings? Honestly, I don't know much about it, as I never have faced the scenario you just described. Anyway, if this doesn't help, I hope someone with a better idea will answer you. Good luck!
Click to expand...
Click to collapse
There's no such option in Sim I checked before. Maybe something to do with firmware. Anyway thanks for help.

!!!!!!!Root2!!!!!! said:
I'm on latest ROS MIUI and while playing game of streaming YouTube if I get a call my Data is disabled. Please help. Thanks
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Click to collapse
It is normal, you are playing games in 4g/LTE mode but when you got a call your sim mode needs to switch to 3g mode. That's the reason you got a slower internet connection while there is calling. The VoLTE mode is what you need, for you to use data connection while you are talking to someone in a call, but i think you sim card doesn't support VoLTE mode. Try to research about your sim card if it's VoLTE capable. Here in the philippines there is no VoLTE capable sim. I hope this helps. Thanks.

cantfool said:
It is normal, you are playing games in 4g/LTE mode but when you got a call your sim mode needs to switch to 3g mode. That's the reason you got a slower internet connection while there is calling. The VoLTE mode is what you need, for you to use data connection while you are talking to someone in a call, but i think you sim card doesn't support VoLTE mode. Try to research about your sim card if it's VoLTE capable. Here in the philippines there is no VoLTE capable sim. I hope this helps. Thanks.
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Yes bro my sim is volte supported. Before I flashed cr 6.0 this never happened. But in cr 6.0 I started getting this problem. Even after switching to ROS MIUI it's there.

!!!!!!!Root2!!!!!! said:
Yes bro my sim is volte supported. Before I flashed cr 6.0 this never happened. But in cr 6.0 I started getting this problem. Even after switching to ROS MIUI it's there.
Click to expand...
Click to collapse
Do you have the volte icon on status bar? Maybe you network preference (GSM/WCDMA/LTE) is wrong, trying to use 2G/3G if available, instead 4G. Try to switch to "LTE only" and check if you can make call.

vlouis said:
Do you have the volte icon on status bar? Maybe you network preference (GSM/WCDMA/LTE) is wrong, trying to use 2G/3G if available, instead 4G. Try to switch to "LTE only" and check if you can make call.
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I flashed Superior is yesterday. The ROM is volte supported but still I'm not getting volte! I tried lte mode but can't use data while in call. I'm really frustrated now. :crying:

!!!!!!!Root2!!!!!! said:
I flashed Superior is yesterday. The ROM is volte supported but still I'm not getting volte! I tried lte mode but can't use data while in call. I'm really frustrated now. :crying:
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The ROM is volte supported but still I'm not getting volte!
Not enough, you need to have volte (4G voice) activated on your sim card too!
I tried lte mode but can't use data while in call.
If in call the connection mode change from LTE/4G to H/3G or 2G, you don't have volte. Try to call somebody, and check the status bar network icon. Only 4G with volte able to have call and data same time.
I recently get volte working on my phone (after sending a "I want volte" mail to service provider).
This depend on service provider, some activating volte only for "officially supported" phones (my case), some automatically for all, and some have 4G network only for data and for voice using only the "old" 3G/2G.

vlouis said:
The ROM is volte supported but still I'm not getting volte!
Not enough, you need to have volte (4G voice) activated on your sim card too!
I tried lte mode but can't use data while in call.
If in call the connection mode change from LTE/4G to H/3G or 2G, you don't have volte. Try to call somebody, and check the status bar network icon. Only 4G with volte able to have call and data same time.
I recently get volte working on my phone (after sending a "I want volte" mail to service provider).
This depend on service provider, some activating volte only for "officially supported" phones (my case), some automatically for all, and some have 4G network only for data and for voice using only the "old" 3G/2G.
Click to expand...
Click to collapse
Oh bro my sim card is already volte supported but still I wasn't getting volte. I fixed it by flashing 10.3.6 firmware in ofox. Now my volte is back.