Does the International version support Wi-Fi calling and VolTE on T-Mobile?

nitin1009 · Apr 29, 2016

I have the G935f - s7 Edge using AT&T sim card. The rom is from Egypt (got it form eBay Techno Trading). Wondering would the Czech Republic ROM really add Wi-Fi Calling or is that only for Tmobile Sim cards? Also anyone figure out how to add Wi-Fi. I am switching to AT&T prepaid and my 3G micro-cell won't work if I did that which means falling back on Wi-Fi Calling would be preferred. TMo sucks in my area.

Also which ROM gets the fastest software updates? Does Flashing require rooting? I know it's a dream but would like to keep Samsung Pay hope open.

jjohn7293 · Apr 30, 2016

Cloudrift said:
The superman rom according to rootuser11(who's on T-Mobile) supports VoLTE.

How is this accomplished?

Sent from my SM-G935F using XDA-Developers mobile app

Cloudrift · May 2, 2016

km8j said:
Evidence? Is this TMO US?

Yes, according to him.

rootuser11 said:
Mine stays with LTE when I make a call and talk. I am currently using superman 1.3 rom.

Mine is g930s btw not g930f. This is the only variant with 64gb internal storage without the samsumg logo on the front.

rootuser11 said:
Yes for me

Sent from my SM-G935F using Tapatalk

jjohn7293 · May 3, 2016

For anyone still trying to get the g930f to work with T-Mobile, I have tried and tried but I felt that it was a losing battle anyway because T-Mobile deprioritizes you after 21 GB. I found out that cricket just recently released an unlimited everything plan including unlimited LTE with no throttling or slow downs for $70, or $65 if you have auto pay. Here's the kicker tho... The reason they offer unlimited LTE on the ATT network while charging less than ATT is because the max speed is 8mbs. I switched because that beats my T-Mobile average speed anyway

Sent from my SM-G935F using XDA-Developers mobile app

radiohead14 · May 3, 2016

km8j said:
Wait wait wait wait... The people getting VoLTE to work with other firmwares, are you on TMOBILE USA?

cward0625 said:
Is there any concern with 911 calls not working? Just curious as that was my understanding as to the risk with non certified t-mobile devices from different articles.

has there been solid confirmations on both questions above? thanks

phoenix_rizzen · May 4, 2016

mathieulh said:
It's the same rom, only the volte option changes. The only con I could find is that updates may not be as fast as on the unbranded version of the rom.

There is no bloatware on the BOG cec rom, they look and act just like the unbranded version.

Envoyé de mon SM-G935F en utilisant Tapatalk

Hrm. Would this also work with the Canadian version? It's also a Exynos, and (from what I've read) compatible with G930F ROMs.

Wonder if that would allow Android Pay/Samsung Pay to work? SureTap Wallet (the hokey Canadian equivalent) is anemic and restricted to a single banks' credit cards.

Sent from my SM-G930W8 using Tapatalk

vzaliva · May 4, 2016

lost_ said:
To try to get VoLTE working, get a firmware from an operator listed in the attached list (courtesy of GSA - Global Mobile Suppliers Assoc.). T-Mobile Czech is the only other TMo operator beside US. The Czech firmware is branded with Tmo boot logo. Beside Tmo US, other operators that have both VoLTE and Wifi calling include Rogers (SM-G930W8, lack of publicly available firmware) and Swisscom..

Thank you very much for researching this! I am extremely curious to hear from somebody who tried Czech firmware on T-mobile USA. At this moment I could not experiment with updating firmware on my S7 as it is my main phone which is critical for my work and have tons of data, applications and settings which I do not want to re-install and re-configure. But if somebody will confirm that Czech firmware provides Wi-Fi calling I will do it.

lost_ · May 4, 2016

I think collectively all the information on this thread is pretty complete regarding the current state of T-Mobile US VoLTE on 930F. Those who are curious just have to go through this thread thoroughly.

As noted on the various posts, T-Mobile US VoLTE worked for some. I tried their same method and it didn't work for me, even after painstakingly modifying CSC files (I happen to have both 930T and 930F). I pm'd someone (who does not yet own a 930F) and got more information about the framework needing to be modified to enable VoLTE on T-Mobile USA network, due to the way constants are compiled. I don't have the time to do it but hopefully when he gets his international variant, he would work on it. Don't ask me who it was as I'm sure if/when he's done it, he'll share it here on XDA.

SithLord***679 · May 9, 2016

To The Members Who Flashed Their Samsung S7 G930F to T-Mobile Czech
So What Type of Network Icons Are You Getting on T-Mobile Czech ? E.g E,3G and LTE or E,H+ and 4G ?
Personally I Like E,3G and LTE icons Better

bwhite12345 · May 20, 2016

BlackCash said:
To The Members Who Flashed Their Samsung S7 G930F to T-Mobile Czech
So What Type of Network Icons Are You Getting on T-Mobile Czech ? E.g E,3G and LTE or E,H+ and 4G ?
Personally I Like E,3G and LTE icons Better

LTE icons and much better speeds.

G935FD on stock firmware was <1M down, 2-3M up on T-Mobile, ~8M up/down on AT&T. Both said 4G - never saw LTE.
Flashed to T-Mobile Czech, now getting 30M up/down on T-Mobile, ~ 8M up/down on AT-T. Both now say LTE.

While LTE Discovery showed LTE towers, on stock firmware it was like it wasn't actually using LTE but older 2G-4G networks on both carriers. With T-Mobile Czech firmware it is now definitely using LTE on both carriers.

Native T-Mobile and AT&T SIMs, not MVNOs.

No wi-Fi calling option though - would love to attain that for T-Mobile given the way it's network is.

thegendler · May 21, 2016

bwhite12345 said:
LTE icons and much better speeds.

G935FD on stock firmware was <1M down, 2-3M up on T-Mobile, ~8M up/down on AT&T. Both said 4G - never saw LTE.
Flashed to T-Mobile Czech, now getting 30M up/down on T-Mobile, ~ 8M up/down on AT-T. Both now say LTE.

While LTE Discovery showed LTE towers, on stock firmware it was like it wasn't actually using LTE but older 2G-4G networks on both carriers. With T-Mobile Czech firmware it is now definitely using LTE on both carriers.

Native T-Mobile and AT&T SIMs, not MVNOs.

No wi-Fi calling option though - would love to attain that for T-Mobile given the way it's network is.

You flashed the G930F to the Czech T-Mobile firmware? Can you link to that firmware? Do you also have a G930FD? Did you change the firmware on that at all?

rp3 · May 25, 2016

Can you upload your CSC files, (others.xml and customer.xml from system/csc). I have been trying to modify my tekHD install to support VOLTE.

bwhite12345 said:
LTE icons and much better speeds.

G935FD on stock firmware was <1M down, 2-3M up on T-Mobile, ~8M up/down on AT&T. Both said 4G - never saw LTE.
Flashed to T-Mobile Czech, now getting 30M up/down on T-Mobile, ~ 8M up/down on AT-T. Both now say LTE.

While LTE Discovery showed LTE towers, on stock firmware it was like it wasn't actually using LTE but older 2G-4G networks on both carriers. With T-Mobile Czech firmware it is now definitely using LTE on both carriers.

Native T-Mobile and AT&T SIMs, not MVNOs.

No wi-Fi calling option though - would love to attain that for T-Mobile given the way it's network is.

bwhite12345 · May 25, 2016

rp3 said:
Can you upload your CSC files, (others.xml and customer.xml from system/csc). I have been trying to modify my tekHD install to support VOLTE.

Sadly I am returning my 935FD as I could never get the two SIMs to play nicely in this phone (for data). Phone worked great with either SIM installed, but with both installed I could not get a stable data connection. I think it is meant for two SIMs from same carrier to have a second voice/text line, but not meant for two SIMs from different carriers. At least TMo and ATT don't work well in this phone when both installed, unsure of other carrier combinations. When I did manage to get data working from one SIM when both SIMs were installed, it would fail to transition to and from Wi-Fi and reconnect to LTE/4G on a consistent basis unless I rebooted the phone after leaving Wi-Fi.

Never attained VoLTE or TMo WiFi using various ROM found in other threads. Wi-Fi on TMo is important to me because they really suck as a carrier and I need it in my home despite being in an urban setting close to a city center. I also get free TMo in-flight texting on GoGo equipped planes and since I travel a good bit that is a nice perk, but it requires TMo WiFi. Unlocked 935T is on the way.

filterxg · May 26, 2016

bwhite12345 said:
Sadly I am returning my 935FD as I could never get the two SIMs to play nicely in this phone (for data). Phone worked great with either SIM installed, but with both installed I could not get a stable data connection. I think it is meant for two SIMs from same carrier to have a second voice/text line, but not meant for two SIMs from different carriers. At least TMo and ATT don't work well in this phone when both installed, unsure of other carrier combinations. When I did manage to get data working from one SIM when both SIMs were installed, it would fail to transition to and from Wi-Fi and reconnect to LTE/4G on a consistent basis unless I rebooted the phone after leaving Wi-Fi.

Never attained VoLTE or TMo WiFi using various ROM found in other threads. Wi-Fi on TMo is important to me because they really suck as a carrier and I need it in my home despite being in an urban setting close to a city center. I also get free TMo in-flight texting on GoGo equipped planes and since I travel a good bit that is a nice perk, but it requires TMo WiFi. Unlocked 935T is on the way.

Super helpful! You just saved me $500.

My work restricts me to AT&T galaxy phones (unrooted) or iPhones. Then I have T-Mobile for my personal phone.

I've wanted to merge the two on a dual sim phone for a long time. And had hoped this would be the phone that finally did it.

Guess the wait continues.

Sent from my ASUS_Z00A using Tapatalk

five40 · Jun 29, 2016

duvalbmarley said:
Only on tmobile branded phones will wifi calling or VoLTE work

Not true!
I get wifi calling on my Nexus 6P
As for VoLTE I haven't investigated into the matter.

jrfan888 · Jun 29, 2016

filterxg said:
Super helpful! You just saved me $500.

My work restricts me to AT&T galaxy phones (unrooted) or iPhones. Then I have T-Mobile for my personal phone.

I've wanted to merge the two on a dual sim phone for a long time. And had hoped this would be the phone that finally did it.

Guess the wait continues.

Sent from my ASUS_Z00A using Tapatalk

I currently use T-Mobile and ATT on the same G930FD. I dont see a data hand off problem. i always keep my data on the T-Mo sim and voice calling on the ATT.

EddiePR · Jun 29, 2016

I have sm-g930f unlocked on tmobile netwok and i have no Volte on settings. When i do a call the signal changes LTe to 3G. Before this i had the tmobile note 5 and i remember the international roms lost the option of volte and wifi calling. You need a tmobile rom and kernel

GuestK0080 · Jun 30, 2016

jrfan888 said:
I currently use T-Mobile and ATT on the same G930FD. I dont see a data hand off problem. i always keep my data on the T-Mo sim and voice calling on the ATT.

Is your tmo sim 1 or 2? I have tmo and att as well on a g930fd and mine prefers sim 1 (tmo) for data. Even on the latest firmware samsung hasnt fixed it. When im driving in the car, moving around town, etc it it will switch from sim 2 data which is att to sim 1 and of course sim 1 at the time is not set for data so im dead in the water until I check the phone. I would leave it on sim 1 for data since I have an unlimited plan but tmo coverage in the Dallas area has always been hit or miss. Its their band 4 that sucks. I have better signal with band 12 or band 2 but all my phones seem to prefer tmo band 4 which just doesnt work as well as band 12 in low signal areas, and good luck with band 4 inside buildings. Which is why my other sim is att. Im tempted to cancel tmo and switch it to att but I pay a lot less with tmo and I like tmobile tuesdays lol. Lately I just leave sim 1 disabled until I really need it since it seems to be better on battery and the number autoforwards anyway.

jrfan888 · Jun 30, 2016

sabooher said:
Is your tmo sim 1 or 2? I have tmo and att as well on a g930fd and mine prefers sim 1 (tmo) for data. Even on the latest firmware samsung hasnt fixed it. When im driving in the car, moving around town, etc it it will switch from sim 2 data which is att to sim 1 and of course sim 1 at the time is not set for data so im dead in the water until I check the phone. I would leave it on sim 1 for data since I have an unlimited plan but tmo coverage in the Dallas area has always been hit or miss. Its their band 4 that sucks. I have better signal with band 12 or band 2 but all my phones seem to prefer tmo band 4 which just doesnt work as well as band 12 in low signal areas, and good luck with band 4 inside buildings. Which is why my other sim is att. Im tempted to cancel tmo and switch it to att but I pay a lot less with tmo and I like tmobile tuesdays lol. Lately I just leave sim 1 disabled until I really need it since it seems to be better on battery and the number autoforwards anyway.

T-Mo is in the first slot and Att in the second. I didn't think it mattered because when I switch, I make sure it matches the one I'm making calls with so I have LTE.

GuestK0080 · Jun 30, 2016

jrfan888 said:
T-Mo is in the first slot and Att in the second. I didn't think it mattered because when I switch, I make sure it matches the one I'm making calls with so I have LTE.

Ive noticed and others have reported the issue on the regular s7 and edge duos that the active data sim will automatically switch to the other sim for data, which isnt active for data so then you have nothing until you switch them back manually. Problem doesnt exist if I just disable one of the sims. Ifs frustrating.

Does the International version support Wi-Fi calling and VolTE on T-Mobile?

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