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[Q] VoLTE on Unlocked (T-Mobile)

I have the Unlocked A9 and I'm using it on T-Mobile USA.
Setting--> Mobile Data--> Voice over LTE is checked.
VoLTE worked with original firmware, but with the November Security Update (639737.6), it no longer works for me. (VoLTE = calls made under 4G LTE. When I make phone calls now, it changes to 4G even though I have 4 bars 4G LTE).
Please let me know if it works for you. Thanks.

I'm still waiting for my unlocked A9 for use on T-Mobile, so I can't give you another example.
I have read that there is no such thing as 4G voice, only (4G) VoLTE. (4G = LTE = data only.) If it is 4G (i.e. data) and doesn't support VoLTE then it must be using a 2G (GSM) band for voice. If it is showing 4G when you are talking then I think it must be VoLTE. At least that is how I understand things.

I'm on the latest ota update for the unlocked version and VoLTE works fine for me. I was concerned unlocking the bootloader would change that but i just completed that and calls still go over lte
In fact I've left my phone in lte only mode for the past week

treeco72 said:
I'm on the latest ota update for the unlocked version and VoLTE works fine for me. I was concerned unlocking the bootloader would change that but i just completed that and calls still go over lte
In fact I've left my phone in lte only mode for the past week
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Click to collapse
Thanks for the input. Based on our info, I'm surprised that VoLTE does not work for me. When I make a call the 4G LTE goes to 4G meaning that it's a GSM call (not through data.) (LTE Discovery confirms this, as the LTE radio shuts-off during the call.)
I might factory-reset my phone and start from the beginning. Not happy, since this is hours of work...

razpuli said:
Thanks for the input.
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Have you tried different cell sites? Perhaps your phone finds the current lte connection to be unsuitable for volte.

treeco72 said:
Have you tried different cell sites? Perhaps your phone finds the current lte connection to be unsuitable for volte.
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Could be, but I have a Samsung Avant sitting next to it, and the Avant's VoLTE works while on my A9 it does not. Speed test results are similar for the phones, so I know that the connection is good.
Just got off the phone with T-Mobile, they transferred me to HTC tech support. HTC wasn't much help (just reading from a computer screen). The tech promised that a level 2 support person would call me in the next 24-72 hours.

treeco72 said:
I'm on the latest ota update for the unlocked version and VoLTE works fine for me. I was concerned unlocking the bootloader would change that but i just completed that and calls still go over lte
In fact I've left my phone in lte only mode for the past week
Click to expand...
Click to collapse
Thanks for all your help. When I read that you are on the latest ota update and your VoLTE works, I suspected it was my phone. Well, I factory-reset my A9 this morning, and VoLTE works now.
BTW, no call from HTC. You would think that they would be interested in helping buyers of their new flagship phone, but nothing.

razpuli said:
BTW, no call from HTC. You would think that they would be interested in helping buyers of their new flagship phone, but nothing.
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I think they are buried. I have tried emailing them this week about accessories, also tried their chat support, and just nothing. And still no shipping date for my unlocked garnet of 23 Oct. I really don't think they were ready for this introduction and the demand that followed. I just hope the phone is worth it.
Greg

CarinaPDX said:
I think they are buried. I have tried emailing them this week about accessories, also tried their chat support, and just nothing. And still no shipping date for my unlocked garnet of 23 Oct. I really don't think they were ready for this introduction and the demand that followed. I just hope the phone is worth it.
Greg
Click to expand...
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I like the A9 a lot. Coming from a Samsung S4, the signal strength is OK, but I am very pleased with the battery -- it last all day for me. Screen is bright, camera is good, and it has the latest Android.

razpuli said:
I have the Unlocked A9 and I'm using it on T-Mobile USA.
Setting--> Mobile Data--> Voice over LTE is checked.
VoLTE worked with original firmware, but with the November Security Update (639737.6), it no longer works for me. (VoLTE = calls made under 4G LTE. When I make phone calls now, it changes to 4G even though I have 4 bars 4G LTE).
Please let me know if it works for you. Thanks.
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Click to collapse
can you tell me your apn settings for t-mobile on a AT&T unlocked a9?

Att wifi calling

I was able to setup wifi calling on att, but is set to mobile preferred, anyway to change this? At least on phone app settings I cannot change it to wifi calling preferred.

digitalundertaker said:
I was able to setup wifi calling on att, but is set to mobile preferred, anyway to change this? At least on phone app settings I cannot change it to wifi calling preferred.
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Probably in system settings / Network and internet / Mobile Network

lollyjay said:
Probably in system settings / Network and internet / Mobile Network
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Click to collapse
Same menu nothing there.

digitalundertaker said:
I was able to setup wifi calling on att, but is set to mobile preferred, anyway to change this? At least on phone app settings I cannot change it to wifi calling preferred.
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I just set mine up, and can't find the option either. I just googled this problem and it appears the same thing happened on the Pixel 2. One guy said that he called Pixel support and they said that it isn't possible to set wifi calling to preferred. Apparently wifi calling will kick in when needed. I tried it just now, and it seems to be working.

lyall29 said:
I just set mine up, and can't find the option either. I just googled this problem and it appears the same thing happened on the Pixel 2. One guy said that he called Pixel support and they said that it isn't possible to set wifi calling to preferred. Apparently wifi calling will kick in when needed. I tried it just now, and it seems to be working.
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Excellent to have Wifi Calling on Att finally on our pixels!:good:

I was wondering if wifi calling would work with at&t. If I remember right hd calling worked with the p2 with the right sim and getting it provisioned on your line but wifi calling didn't work. That only worked on phones from at&t. There were a couple places that I needed wifi calling and it came in handy. One was in a couple places at work with bad cell service and another was in a friend's home in the mountains of PA. wifi but no cell towers around. If wifi calling works at all I'll be glad.

digitalundertaker said:
Same menu nothing there.
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So nothing happens when you tap Wi-Fi calling then. Bummer
Edit: we'll have to wait for custom ROMs

dmb219 said:
I was wondering if wifi calling would work with at&t. If I remember right hd calling worked with the p2 with the right sim and getting it provisioned on your line but wifi calling didn't work. That only worked on phones from at&t. There were a couple places that I needed wifi calling and it came in handy. One was in a couple places at work with bad cell service and another was in a friend's home in the mountains of PA. wifi but no cell towers around. If wifi calling works at all I'll be glad.
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Yeah I'm surprised also. I always missed wifi calling on my Pixel 2 XL. I definitely works on my Pixel 3 xl on AT&T, you just can't set wifi calling to preferred.
---------- Post added at 01:59 AM ---------- Previous post was at 01:55 AM ----------
lollyjay said:
So nothing happens when you tap Wi-Fi calling then. Bummer
Edit: we'll have to wait for custom ROMs
Click to expand...
Click to collapse
Wifi calling does work, I tried a test call and it worked fine. I'm glad, because I live in an area where the cell signal is very weak.

lyall29 said:
Yeah I'm surprised also. I always missed wifi calling on my Pixel 2 XL. I definitely works on my Pixel 3 xl on AT&T, you just can't set wifi calling to preferred.
---------- Post added at 01:59 AM ---------- Previous post was at 01:55 AM ----------
Wifi calling does work, I tried a test call and it worked fine. I'm glad, because I live in an area where the cell signal is very weak.
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That's great that it works. I would only need it when cell is unavailable. I sold my p2xl and had an s9+ for a while. That was a mistake. It was a good phone but I need my pixel back. Thanks for the info.

If I remember right that's how all the pixels are even on Verizon.
No option to make WiFi calling preferred.
At least it is working on Att because previous ones did not.

On my Pixel 2 XL, on TMobile, I have the option to set wifi calling to preferred. My 3 had not arrived to check yet. I do not have the setting in your screenshot for the emergency address.
Sent from my Pixel 2 XL using Tapatalk

jaben2 said:
If I remember right that's how all the pixels are even on Verizon.
No option to make WiFi calling preferred.
At least it is working on Att because previous ones did not.
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WiFi

lollyjay said:
WiFi
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What service do you have?
I know on Verizon you could never make it preferred, and Att never worked.
Unless Verizon changed after I changed carriers

jaben2 said:
What service do you have?
I know on Verizon you could never make it preferred, and Att never worked.
Unless Verizon changed after I changed carriers
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Click to collapse
I simply tapped the Calling preference and got a selection menu
I am on factory unlocked

lollyjay said:
I simply tapped the Calling preference and got a selection menu
I am on factory unlocked
Click to expand...
Click to collapse
This is what we see on AT&T...we don't have the option to select calling preference.

Guys!! This is a huge win for pixels and non at&t branded phone lovers!!! Never before in the history of at&t and Android has VoWiFi worked on non at&t branded phones.. I couldn't believe my stroke of good luck when I tested it today!! Thank you thank you Google. I had switched to TMobile because of this and carried at&t as secondary to fill in the gaps.. but i may just switch back.. so happy.. also, TMobile is the only American carrier that let's you prefer wifi calling over mobile.. so no dice there.. but hey, I'll take it.. and you can always enable airplane mode and force wifi calling.
Also, I tested tonight in a poor at&t coverage area and it seemed to switch between wifi and cellular calling just fine!!
---------- Post added at 03:04 AM ---------- Previous post was at 03:03 AM ----------
lollyjay said:
I simply tapped the Calling preference and got a selection menu
I am on factory unlocked
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Who is your carrier? Not at&t or Verizon I suspect.

crowsnestitsupport said:
Who is your carrier? Not at&t or Verizon I suspect.
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T-Mobile rules lol

lollyjay said:
T-Mobile rules lol
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If it does for you that's great...I tried it for 24 hrs. Had no signal my whole day while work in my office. So no go for me, even with it being a lot cheaper service.
I do hope they keep improving though, for competition purposes.

jaben2 said:
If it does for you that's great...I tried it for 24 hrs. Had no signal my whole day while work in my office. So no go for me, even with it being a lot cheaper service.
I do hope they keep improving though, for competition purposes.
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Yes that's why VoWiFi is so great

lollyjay said:
T-Mobile rules lol
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Yes they do! In so many ways and areas. And they have improved so much in the last year. I travel a lot and love watching coverage and I could name dozens and dozens of new towers. But they need 100s and 100s to compete.. let's hope the Sprint/tmo merger got through. It would be awesome to have reliable competition to dumb and dumber.

US T-Mobile VoLTE support?

Does the US version support US T-Mobile VoLTE without reflashing mixing US oem.sin into foreign firmware?

You'd need to be on US region firmware to use VoLTE. For example, I flashed my Xperia 1 (J9110) to J8170 and everything works, including VoLTE - except for the 2nd sim.

It's carrier depending. The Sony is cable.

iArvee said:
You'd need to be on US region firmware to use VoLTE. For example, I flashed my Xperia 1 (J9110) to J8170 and everything works, including VoLTE - except for the 2nd sim.
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Silly me. I didn't realize this isn't out yet. GSMArena indicated October release, and I assumed it was already out and came here.
I suppose we won't know if the Xperia 5 sold in the US (ie Amazon, BestBuy, Adorama, etc) will support VoLTE out of the box. XperiFirm shows:
J8210 (listed in GSMArena) - UK & Ireland
J9210 (listed in GSMArena) - Europe, UK, Russia, Taiwan, HK and China
J8270 (listed in GSMArena) - Not found in XperiFirm
SOV41 (not mentioned in GSMArena) - Japan
901SO (not mentioned in GSMArena) - Japan
I suppose it will support VoLTE, as I read in the past in another thread about how the international firmwares recently started including VoLTE for the US. I am still on the XZ1 Compact, so I don't have any personal experience.
EDIT: Sorry, the thing about US VoLTE support in international firmwares might have been from the Samsung threads. I've been researching the S10e and Xperia 5 as my next phone after my XZ1 Compact, that my brain is fried.

StHalcyon said:
Silly me. I didn't realize this isn't out yet. GSMArena indicated October release, and I assumed it was already out and came here.
I suppose we won't know if the Xperia 5 sold in the US (ie Amazon, BestBuy, Adorama, etc) will support VoLTE out of the box. XperiFirm shows:
J8210 (listed in GSMArena) - UK & Ireland
J9210 (listed in GSMArena) - Europe, UK, Russia, Taiwan, HK and China
J8270 (listed in GSMArena) - Not found in XperiFirm
SOV41 (not mentioned in GSMArena) - Japan
901SO (not mentioned in GSMArena) - Japan
I suppose it will support VoLTE, as I read in the past in another thread about how the international firmwares recently started including VoLTE for the US. I am still on the XZ1 Compact, so I don't have any personal experience.
EDIT: Sorry, the thing about US VoLTE support in international firmwares might have been from the Samsung threads. I've been researching the S10e and Xperia 5 as my next phone after my XZ1 Compact, that my brain is fried.
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Click to collapse
IT does not. Here in Denmark, Sony got zero volte or wofi, it's carrier lablet.
And they know, phones is NOT Sony's prime, no more.
We all remember the SE back in the days. :good:

Have a European 5 that I flashed to US version (firmware is now on Xperifirm) and VoLTE does work on T-Mobile US.

thatguy222 said:
Have a European 5 that I flashed to US version (firmware is now on Xperifirm) and VoLTE does work on T-Mobile US.
Click to expand...
Click to collapse
Any chance that WiFi calling works as well? I'm seriously considering this device as an upgrade from the XZ1 compact. I'm probably hoping for too much here as that would have required a certification.

Unfortunately WiFi calling is not showing up for me on T-Mobile US. I can't remember the last time this was an issue. I'll call them later today to see whether the plan on whitelisting the Xperia 5 for WiFi calling.
I also can't tell if we're actually using VoLTE or not. The option is there in setting and LTE stays connected during a call, but I'm not certain whether the call is actually connecting nicer LTE.

thatguy222 said:
Unfortunately WiFi calling is not showing up for me on T-Mobile US. I can't remember the last time this was an issue. I'll call them later today to see whether the plan on whitelisting the Xperia 5 for WiFi calling.
I also can't tell if we're actually using VoLTE or not. The option is there in setting and LTE stays connected during a call, but I'm not certain whether the call is actually connecting nicer LTE.
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Okay, thanks. As far as the VoLTE, I've found the LTE Discovery app works well. Just make a call and verify it's still using band 12

genorok said:
Okay, thanks. As far as the VoLTE, I've found the LTE Discovery app works well. Just make a call and verify it's still using band 12
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I just made a call and watched the app. Unfortunately I remained on Band 4 during the call. Sounds like this means the call was not using VoLTE. Very disappointing.
Just received a call and there phone app said the call was over WiFi. That setting is nowhere to be found so that's interesting.
The person on the other end did confirm a echo on speaker phone, though. Not sure how to get rid of that.

thatguy222 said:
I just made a call and watched the app. Unfortunately I remained on Band 4 during the call. Sounds like this means the call was not using VoLTE. Very disappointing.
Just received a call and there phone app said the call was over WiFi. That setting is nowhere to be found so that's interesting.
The person on the other end did confirm a echo on speaker phone, though. Not sure how to get rid of that.
Click to expand...
Click to collapse
Thank you. That's an interesting find. Also, I wouldn't expect the phone to switch during a call from band 4 to band 12. The only way to see would be to find a spot where you're on band 12 and see if it switches away during a call. It should stay on the strongest signal band.

genorok said:
Any chance that WiFi calling works as well? I'm seriously considering this device as an upgrade from the XZ1 compact. I'm probably hoping for too much here as that would have required a certification.
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Click to collapse
genorok said:
Thank you. That's an interesting find. Also, I wouldn't expect the phone to switch during a call from band 4 to band 12. The only way to see would be to find a spot where you're on band 12 and see if it switches away during a call. It should stay on the strongest signal band.
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Ah, I misunderstood your point about band 12 originally, apologies. I received calls yesterday and today and the Phone app says "calling over data," so I guess that is how they're saying VoLTE. I swear the terminology shown for both VoWiFi and VoLTE was different on my OnePlus 7 Pro.
In summary, for those skipping to the end, VoWiFi and VoLTE seem to work (on T-Mobile USA) even though it's not obvious.

genorok said:
Any chance that WiFi calling works as well? I'm seriously considering this device as an upgrade from the XZ1 compact. I'm probably hoping for too much here as that would have required a certification.
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Click to collapse
I am upgrading from an XZ1 Compact as well! will be receiving my US version tomorrow and will post as soon as i find out

Hi, has anyone been able to fully confirm VoLTE/Wifi Calling for T-Mobile? Thanks.

nicogu said:
Hi, has anyone been able to fully confirm VoLTE/Wifi Calling for T-Mobile? Thanks.
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Click to collapse
VoLTE is available and works
I do not think WIFI calling is enabled/allowed on this phone.
I could not find wifi calling settings to enable/disable on the phone, so i did some tests to check if it works:
1. When I call within a WIFI network and TMobile off, the calls wont go through.
2. Also, when everything is on and I am connected on WIFI but very poor TMobile connection, I do not see WIFI calling

jckozy86 said:
VoLTE is available and works
I do not think WIFI calling is enabled/allowed on this phone.
I could not find wifi calling settings to enable/disable on the phone, so i did some tests to check if it works:
1. When I call within a WIFI network and TMobile off, the calls wont go through.
2. Also, when everything is on and I am connected on WIFI but very poor TMobile connection, I do not see WIFI calling
Click to expand...
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Thats a bummer, thanks for replying though!

nicogu said:
Thats a bummer, thanks for replying though!
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Click to collapse
There is indeed no option to enable this but WiFi calling does work on T-Mobile USA.

I bought the phone last week. I compared the bands and connectivity with my XZ1 Compact. It definitely has VoLTE including band 12, but unfortunately it does not have any working WiFi calling on Tmo. No option and it doesn't make calls or texts on WiFi only connections.
I will say that it does seem to have a slightly better signal strength than my XZ1 Compact had.

Bump for any updates?

I get calls in lte mode so yeah I'd say USA volte works

T-Mobile VoLTE and WiFi calling

Can anyone confirm working T-Mobile VoLTE and WiFi calling in Philadelphia area with the 8? I'm looking buy the 8 directly from OnePlus, but I'm seeing conflicting reports of VoLTE and WiFi calling NOT working properly.
Thanks.

Is anyone with the IN2015 variant using T-Mobile getting VoLTE and WiFi calling?

BeardKing said:
Is anyone with the IN2015 variant using T-Mobile getting VoLTE and WiFi calling?
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Click to collapse
I'm in Massachusetts using an IN2015 on T-Mobile and just verified that VoLTE and VoWiFi are working fine for me.

rbet said:
I'm in Massachusetts using an IN2015 on T-Mobile and just verified that VoLTE and VoWiFi are working fine for me.
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Thank you! You don't know how hard it's been to get an answer to this. ?️

BeardKing said:
Thank you! You don't know how hard it's been to get an answer to this. ️
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Happy to help
A little heads up though to get anything other than WiFi working I did have to go into the SIM settings and turn on mobile data as well as enable VoLTE and VoWiFi, not sure if that was related to activating it on release day or because it's the global model on T-Mobile (didn't really look into it since it was just flipping 3 settings then everything just worked).

rbet said:
Happy to help
A little heads up though to get anything other than WiFi working I did have to go into the SIM settings and turn on mobile data as well as enable VoLTE and VoWiFi, not sure if that was related to activating it on release day or because it's the global model on T-Mobile (didn't really look into it since it was just flipping 3 settings then everything just worked).
Click to expand...
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Appreciated!

I have the TMobile model and can't find the volte and vowifi settings anywhere?? I'm sure they're enabled but I want to make sure

Wi-Fi Calling

New to this forum. Just got my Motorola One Hyper today. Am I able to make wi-fi calls on this phone? When I go to my Settings, Wi-Fi Calling is grayed out. If I long press it, Wi-Fi Calling comes up, but again, the screen is grayed out. It will not allow me to enable it. I am connected to my home wi-fi network, so that is not the problem. Thanks in advance.

It depends on your carrier, call customer service and ask if they use wifi calling. It works for me on T-Mobile on both stock and omni out of the box.
Beyond that, make sure you are updated to the latest stock firmware. The last update fixed volte and vowifi.

m666p said:
It depends on your carrier, call customer service and ask if they use wifi calling. It works for me on T-Mobile on both stock and omni out of the box.
Beyond that, make sure you are updated to the latest stock firmware. The last update fixed volte and vowifi.
Click to expand...
Click to collapse
Thanks for the response. After the phone went through all of its updating, the wi-fi issue solved itself. But I have another question. This phone was labeled as "International version" when I purchased it. I discovered that it's actually (RETLA), thus the instructions only came in Spanish. Will this be an issue using it in the USA?
Thanks

What's the model number?
Mine is xt2027-1
If it's xt2027-3, you might be missing some lte bands...

m666p said:
What's the model number?
Mine is xt2027-1
If it's xt2027-3, you might be missing some lte bands...
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Click to collapse
Mine is also xt2027-1. Just out of curiosity, what are lte bands, and why are they important?

SeattleDDC said:
Mine is also xt2027-1. Just out of curiosity, what are lte bands, and why are they important?
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Click to collapse
Go to the link below, it compares the bands different models of our phone operate on. If more bands are compatible with your network, your network reception will improve.
https://www.kimovil.com/en/frequency-checker/US/motorola-one-hyper