Develop Bugs

[DEV][MOD][JB] T-Mobile Wi-fi Calling

A while ago, I downloaded a nandroid someone posted from their T-Mobile Galaxy Note II to see if I could pick it apart for wi-fi calling, but I don't use it so I can't really test it and I lost interest. Now, I've packaged up the Wifi Calling app with all of the libs it came with and added in the build.prop from the zip. It might be a lot more than what is needed, but I don't want to have to keep uploading bits and pieces. If you think you have an idea of what you're doing and want to try it out, go for it. I don't really know much about wi-fi calling at all so unless you have some sort of logcat, I'll be of little to no use to you at all. I guess that's about it...
You can use the ics wi-fi calling package to help you out by possibly using it as a reference/using parts/etc.
FOUND HERE
And here is what I've extracted from that 1GB+ package.
CLICK ME
Let us know what you find and good luck
If you feel you might need more files from the original nandroid just let me know.

Nice!
Rooted/OC'd/SynX

nice work will try ,Thanks

Please don't hate but would this work on a sense based rom?

Bangincrazy said:
Please don't hate but would this work on a sense based rom?
Click to expand...
Click to collapse
This is for jelly bean. So no.
Sent from my HTC One S running ViperOneS!

Hm... by the looks of it, it would seem that these are only settings for Wi-Fi calling. So it would seem that you'd have to mod the settings apk to have the option for WiFi calling settings. :/ I'll look into elgins (CM10) source sometime to see if I can add it in. If I can at least get the app starting somewhere, it will be easier for everyone else to debug/fix it up. If anyone has messed with the note 2 and can confirm that WiFi calling is accessed via settings and not launcher (app) that would be helpful as well.
Sent from my MyTouch 4G using xda app-developers app

This is gr8 news !Hopefiully someone can get going on this ,it can benefit not just the Glacier,but other devices as well that already have a fully working JB minus wifi calling.

From what I have seen and read on my HTC One S it is built into the frame work on JB so way above what I know good luck.

im gonna look into this and see what i can do

elginsk8r said:
im gonna look into this and see what i can do
Click to expand...
Click to collapse
I'm thinking the setting could be added in way that is similar to this:
https://github.com/SyNtheticNightma...mmit/bfac7c05daab9f6294f7419ea6173c4a1c569092
Though I don't know the exact name of the package for the wi-fi calling settings... I'd need to decompile it to find that out (unless you know another way, I'm not too familiar with apks). I could also try whipping up an icon for this if you need one.

have you looked at this at all? http://code.google.com/p/the-ims-open-source-project-for-android/

elginsk8r said:
have you looked at this at all? http://code.google.com/p/the-ims-open-source-project-for-android/
Click to expand...
Click to collapse
Nice Find!!! I +1'd it

i saw it a while back, but have yet to try implementing into into a build or anything.

i compared this to ics wifi calling zip and none of the libs from ics zip is in the jb zip

Synthetic.Nightmare said:
Hm... by the looks of it, it would seem that these are only settings for Wi-Fi calling. So it would seem that you'd have to mod the settings apk to have the option for WiFi calling settings. :/ I'll look into elgins (CM10) source sometime to see if I can add it in. If I can at least get the app starting somewhere, it will be easier for everyone else to debug/fix it up. If anyone has messed with the note 2 and can confirm that WiFi calling is accessed via settings and not launcher (app) that would be helpful as well.
Sent from my MyTouch 4G using xda app-developers app
Click to expand...
Click to collapse
Sorry for a late reply (haven't had the T-Mobile Galaxy Note 2 (SGH-T889) so long...
Wifi Calling settings are located under Settings / More settings /
And includes two items: Wi-Fi Calling (this is to enable/disable with a check box), and, Wi-Fi Calling Settings (This offers Connection Preferences [Wi-Fi Preferred / Wi-Fi Only / Cellular Preferred}, and, Help)
For reference, the above menu structure/selections are based on Stock F/W 4.1.1, Build Number JRO03C.T889UVALL4

Is this still a work in progress or has it died?

it sure died.. adding wifi calling to JB has been a task for over a year..no dev has been able ot make this work...so sad.

Try groove IP....its a Google voice app
Sent from my myTouch 4G using xda premium

SurvivorZer0 said:
Try groove IP....its a Google voice app
Sent from my myTouch 4G using xda premium
Click to expand...
Click to collapse
+1 have used groove ip for a long time., well every time I don't pay my bill anyway and I need to make a call on wifi.

Dragonswithin said:
+1 have used groove ip for a long time., well every time I don't pay my bill anyway and I need to make a call on wifi.
Click to expand...
Click to collapse
I use ePhone by Comwave. lol. You get a specific number. And I dont have a working sim card anyways , so I made whatsapp with a textplus number lol

Wifi calling discovery

Ive been looking around and researching on how to get wifi calling on AOSP roms. I have made what I believe to be a big discovery. T-mobile now uses IMS for newer android phones, which is UMA/sip etc. I decompiled the ims-service.apk from the stock DLJA rom. I found an XML that contains the settings to use the service! You can get the IMS installer from here http://code.google.com/p/the-ims-open-source-project-for-android/
I put the settings into the app and tried connecting but it came up with ER05, invalid SIM card. I googled that and it I get leads to saying that the sim isn't authenticated for WIFI calling. I know that it is, because it works fine on stock roms. I've also attached a logcat of me attempting to connect. I've attempted to change some of the info of the strings to reflect my personal phone number but that did not change anything.

layzer253 said:
Ive been looking around and researching on how to get wifi calling on AOSP roms. I have made what I believe to be a big discovery. T-mobile now uses IMS for newer android phones, which is UMA/sip etc. I decompiled the ims-service.apk from the stock DLJA rom. I found an XML that contains the settings to use the service! You can get the IMS installer from here http://code.google.com/p/the-ims-open-source-project-for-android/
I put the settings into the app and tried connecting but it came up with ER05, invalid SIM card. I googled that and it I get leads to saying that the sim isn't authenticated for WIFI calling. I know that it is, because it works fine on stock roms. I've also attached a logcat of me attempting to connect. I've attempted to change some of the info of the strings to reflect my personal phone number but that did not change anything.
Click to expand...
Click to collapse
Great find! Wifi calling is one of my favorite features.
Sent from my Sensation using xda premium

This isn't a suitable thread for "developer discussion." It also doesn't even mention which phone it's for, but based on "DLJA", I'm guessing it's for the SGS3, so it should be moved to the tmobile sgs3 sections.
Take care
Gary

Nice find buddy! Maybe this will go somewhere. Wifi calling is the ONLY feature I miss from touchjizz.
Sent from my T999 GS3 @ 2. 1GHZ

Anyone could have told you it's IMS. I don't get what you "discovered".

psykhotic said:
Anyone could have told you it's IMS. I don't get what you "discovered".
Click to expand...
Click to collapse
Sounds like what he discovered was the xml file with the config in it, but it seems like there must be more to it than that, since it didn't work.

mondokat said:
Sounds like what he discovered was the xml file with the config in it, but it seems like there must be more to it than that, since it didn't work.
Click to expand...
Click to collapse
Correct, I found the settings for the application to work, just need to figure out how to fix the sim authentication error. I was hoping someone would be able to chime in and give some advice

garyd9 said:
This isn't a suitable thread for "developer discussion." It also doesn't even mention which phone it's for, but based on "DLJA", I'm guessing it's for the SGS3, so it should be moved to the tmobile sgs3 sections.
Take care
Gary
Click to expand...
Click to collapse
With all do respect... This is the tmobile sgs3 general section... Unless its been moved already
Sent from my SGH-T999 using Tapatalk 2

Gary moved it out of the Int'l SGS3 Developer's Discussion threads where he has limited Mod powers.

So I took part in a survey this morning sent from T-Mobile. They had some very interesting questions pertaining to Wi-Fi Calling and AOSP ROMS, specifically if I was running on a rooted device, and if I was able to get Wi-Fi calling enabled on whatever ROM I was using. They had other questions about Wi-Fi Calling and how much I would use it, etc...Apparently they're recognizing the community and are starting to ask the right questions. I like this line of thinking!

carltonhimself said:
So I took part in a survey this morning sent from T-Mobile. They had some very interesting questions pertaining to Wi-Fi Calling and AOSP ROMS, specifically if I was running on a rooted device, and if I was able to get Wi-Fi calling enabled on whatever ROM I was using. They had other questions about Wi-Fi Calling and how much I would use it, etc...Apparently they're recognizing the community and are starting to ask the right questions. I like this line of thinking!
Click to expand...
Click to collapse
That's awesome.
Sent from my HTC Glacier using xda premium

It would be interesting to see if this worked without errors on galaxy mod. Then we would know if it's touchwiz specific and have a better idea of where to look. I would try it, but I'm pulling half a mbps at home XD
Sent from my SGH-T999 using xda app-developers app

layzer253 said:
Ive been looking around and researching on how to get wifi calling on AOSP roms. I have made what I believe to be a big discovery. T-mobile now uses IMS for newer android phones, which is UMA/sip etc. I decompiled the ims-service.apk from the stock DLJA rom. I found an XML that contains the settings to use the service! You can get the IMS installer from here http://code.google.com/p/the-ims-open-source-project-for-android/
I put the settings into the app and tried connecting but it came up with ER05, invalid SIM card. I googled that and it I get leads to saying that the sim isn't authenticated for WIFI calling. I know that it is, because it works fine on stock roms. I've also attached a logcat of me attempting to connect. I've attempted to change some of the info of the strings to reflect my personal phone number but that did not change anything.
Click to expand...
Click to collapse
I've written code in C before; isn't there a debugger that could be used so you can step through the code execution step-by-step and see where the problem is?

So is there away to get this to work with asop?
bad ass Baked sg3
/ http://dragcave.net/view/uUS85

tsjoe2 said:
So is there away to get this to work with asop?
bad ass Baked sg3
/ http://dragcave.net/view/uUS85
Click to expand...
Click to collapse
Maybe, we just need someone with time and programming skills in Java and C to figure this out. I only know some C and C++ and have not the time. I would also like to see this work.

tsjoe2 said:
So is there away to get this to work with asop?
bad ass Baked sg3
/ http://dragcave.net/view/uUS85
Click to expand...
Click to collapse
What is with your signature? Weird
And I'm sure the aosp devs would include WiFi calling if they knew how to at this point...
Sent from my SGH-T999 using Tapatalk 2

carltonhimself said:
So I took part in a survey this morning sent from T-Mobile. They had some very interesting questions pertaining to Wi-Fi Calling and AOSP ROMS, specifically if I was running on a rooted device, and if I was able to get Wi-Fi calling enabled on whatever ROM I was using. They had other questions about Wi-Fi Calling and how much I would use it, etc...Apparently they're recognizing the community and are starting to ask the right questions. I like this line of thinking!
Click to expand...
Click to collapse
Hmm that's pretty sweet. Only time I get surveys is when I have to call them to ***** about the double bill I get every time I change my plan etc.
Sent from my SGH-T999 using xda premium

Let us not assume they are asking these questions to try and help us.. Everything T-Mobile has ever demonstrated toward the hacking community was finding ways to prevent or patch and progress made.. like they're going to assist us with tethering or wifi calling on custom ROMs.. not going to happen.. They are probably asking so they can investigate how it is working on an AOSP ROM and patch the exploit..

ingenious247 said:
Let us not assume they are asking these questions to try and help us.. Everything T-Mobile has ever demonstrated toward the hacking community was finding ways to prevent or patch and progress made.. like they're going to assist us with tethering or wifi calling on custom ROMs.. not going to happen.. They are probably asking so they can investigate how it is working on an AOSP ROM and patch the exploit..
Click to expand...
Click to collapse
Ah, the whole "white van full of puppies" ruse ...

Lmao
Sent from my SGH-T999 using xda premium

[Q] Does [ROM][P?+Aokp+Cm] P.A.Cman v19 [01-03-13] comes with Wifi calling??

Does this [ROM][P?+Aokp+Cm] P.A.Cman True All in 1 ROM[01-03-13] comes with WIFI Calling Feature.
For me its a must have feature cuz inside my house i rarely get tmobile reception.
anyone who recently tested... please let me know.

If you want WiFi calling I'd suggest go on PTMR3S Jedi mind 6. That ROM you mentioned does not as its aosp. Plus its outdated we have a updated one that goes up to 23.0

mkdroid said:
Does this [ROM][P?+Aokp+Cm] P.A.Cman True All in 1 ROM[01-03-13] comes with WIFI Calling Feature.
For me its a must have feature cuz inside my house i rarely get tmobile reception.
anyone who recently tested... please let me know.
Click to expand...
Click to collapse
The only Roms with working WiFi calling are official tmojile touchwiz Roms as it is a T-Mobile closed source feature, there are a couple good ones, infamous s2, Jedi mind trick, stock, but if u want t on a asop ROM your out of luck
Sent from my SGH-T989 using xda premium

[REQ] Wi-Fi Calling on GE?

I'd love to be on the Google Edition ROM but whats keeping me back is no WiFi calling, and i need it because its a necessity for me, I would love to try and help and such. I'm thinking it should be possible as of it has a TW kernel and such. Any help?

OreBoySwaggin said:
I'd love to be on the Google Edition ROM but whats keeping me back is no WiFi calling, and i need it because its a necessity for me, I would love to try and help and such. I'm thinking it should be possible as of it has a TW kernel and such. Any help?
Click to expand...
Click to collapse
Nope. Not gonna happen. At least, that has been the conclusion in the other 15 or so threads asking for WiFi calling in any other ROMs besides the stock(ish) T-Mobile TW ROMs... If WiFi calling is a necessity to you, you can pretty much give up on the GE ROMs, AOSP, other carrier's TouchWiz ROMs, etc... One option that DOES work as far as making/receiving calls without the built-in WiFi calling though would be to use GrooveIP forwarded to your Google Chat account, then set your carrier call forwarding to go to your Google Voice number. You can turn Airplane mode on, then set your WiFi on and still be able to receive calls on both your cellular number and Google Voice number. The only thing about that though is that although you can receive calls on both numbers, you can only call out using your GV number. Also, you'd have to toggle airplane mode to receive text messages to your cell number.

lordcheeto03 said:
Nope. Not gonna happen. At least, that has been the conclusion in the other 15 or so threads asking for WiFi calling in any other ROMs besides the stock(ish) T-Mobile TW ROMs... If WiFi calling is a necessity to you, you can pretty much give up on the GE ROMs, AOSP, other carrier's TouchWiz ROMs, etc... One option that DOES work as far as receiving calls though would be to use GrooveIP forwarded to your Google Chat account, then set your carrier call forwarding to go to your Google Voice number. You can turn Airplane mode on, then set your WiFi on and still be able to receive calls on both your cellular number and Google Voice number. Only drawback is that you'd have to toggle Airplane mode to receive texts.
Click to expand...
Click to collapse
Well i saw this guy working on it and it and he said he had it working on other sammy roms..... and its been done before and i would so try to work on it right now. couldnt we just compare say stock GT-i9505 and SGH-M919 roms, and find the files that are in the tmo rom and not in the GT-i9505 rom?

OreBoySwaggin said:
couldnt we just compare say stock GT-i9505 and SGH-M919 roms, and find the files that are in the tmo rom and not in the GT-i9505 rom?
Click to expand...
Click to collapse
There are a few peoples working very hard to do just that. Unfortunately tmobile spread all the necessary files through out the framework. It takes time but I'm sure it will be done. There's a few thread in the developments section as well as the app/theme section if you want to follow it.
☞Sent from here☜

OreBoySwaggin said:
Well i saw this guy working on it and it and he said he had it working on other sammy roms..... and its been done before and i would so try to work on it right now. couldnt we just compare say stock GT-i9505 and SGH-M919 roms, and find the files that are in the tmo rom and not in the GT-i9505 rom?
Click to expand...
Click to collapse
It's no where as easy as your trying to make it seem. It will happen. Judy not any time soon.so you have no choice but to use a stock Rom. Plus all this could of been answered with a simple search. This question has been asked tons of times.
send with my m919 running problem 4.4
---------- Post added at 03:18 PM ---------- Previous post was at 03:16 PM ----------
OreBoySwaggin said:
Well i saw this guy working on it and it and he said he had it working on other sammy roms..... and its been done before and i would so try to work on it right now. couldnt we just compare say stock GT-i9505 and SGH-M919 roms, and find the files that are in the tmo rom and not in the GT-i9505 rom?
Click to expand...
Click to collapse
This was said in the development forum, and he said he MIGHT have it working.Plus he said Sammy roms also, which means other touch wiz based roms, not Google edition
send with my m919 running problem 4.4

lordcheeto03 said:
Nope. Not gonna happen. At least, that has been the conclusion in the other 15 or so threads asking for WiFi calling in any other ROMs besides the stock(ish) T-Mobile TW ROMs... If WiFi calling is a necessity to you, you can pretty much give up on the GE ROMs, AOSP, other carrier's TouchWiz ROMs, etc... One option that DOES work as far as making/receiving calls without the built-in WiFi calling though would be to use GrooveIP forwarded to your Google Chat account, then set your carrier call forwarding to go to your Google Voice number. You can turn Airplane mode on, then set your WiFi on and still be able to receive calls on both your cellular number and Google Voice number. The only thing about that though is that although you can receive calls on both numbers, you can only call out using your GV number. Also, you'd have to toggle airplane mode to receive text messages to your cell number.
Click to expand...
Click to collapse
TheAtheistOtaku said:
It's no where as easy as your trying to make it seem. It will happen. Judy not any time soon.so you have no choice but to use a stock Rom. Plus all this could of been answered with a simple search. This question has been asked tons of times.
send with my m919 running problem 4.4
---------- Post added at 03:18 PM ---------- Previous post was at 03:16 PM ----------
This was said in the development forum, and he said he MIGHT have it working.Plus he said Sammy roms also, which means other touch wiz based roms, not Google edition
send with my m919 running problem 4.4
Click to expand...
Click to collapse
I read somewhere that the GE Roms were TouchWiz but like majorly debloated....

OreBoySwaggin said:
I read somewhere that the GE Roms were TouchWiz but like majorly debloated....
Click to expand...
Click to collapse
True, they are. But even the stock TouchWiz camera doesn't fully work on the GE ROMs. I know the camera has nothing to do with WiFi calling, just pointing out the fact that even though they're both built into the TouchWiz framework, the gutted version of TouchWiz we know as the Google Edition is sufficiently different so as to have some pretty significant obstacles to overcome when porting features to it versus other Stock TW.

lordcheeto03 said:
True, they are. But even the stock TouchWiz camera doesn't fully work on the GE ROMs. I know the camera has nothing to do with WiFi calling, just pointing out the fact that even though they're both built into the TouchWiz framework, the gutted version of TouchWiz we know as the Google Edition is sufficiently different so as to have some pretty significant obstacles to overcome when porting features to it versus other Stock TW.
Click to expand...
Click to collapse
not only that, 4.3 google edition roms have the touchwiz base fully removed, which makes me believe that whatever touchwiz code is in 4.2 google edition roms, is just leftovers

TheAtheistOtaku said:
not only that, 4.3 google edition roms have the touchwiz base fully removed, which makes me believe that whatever touchwiz code is in 4.2 google edition roms, is just leftovers
Click to expand...
Click to collapse
Hmm didnt know that... Doesn't the HTC One Have WiFi Calling too? So they made that possible though and that means its not just TouchWiz. it is on 4.1.2 though.. But there isnt much of a difference between 4.1 and 4.2, isnt there a big difference in 4.3 though?

OreBoySwaggin said:
Hmm didnt know that... Doesn't the HTC One Have WiFi Calling too? So they made that possible though and that means its not just TouchWiz. it is on 4.1.2 though.. But there isnt much of a difference between 4.1 and 4.2, isnt there a big difference in 4.3 though?
Click to expand...
Click to collapse
your comparing apples to oranges, HTC phones have nothing to do with us, what works for them wont work for us.

TheAtheistOtaku said:
your comparing apples to oranges, HTC phones have nothing to do with us, what works for them wont work for us.
Click to expand...
Click to collapse
I wouldn't say that, there are many things that work with both us and them. Such as Android OS, Snapdragon 600, WiFi Calling, etc etc.

OreBoySwaggin said:
I wouldn't say that, there are many things that work with both us and them. Such as Android OS, Snapdragon 600, WiFi Calling, etc etc.
Click to expand...
Click to collapse
cant tell if serious or......

TheAtheistOtaku said:
cant tell if serious or......
Click to expand...
Click to collapse
Merely my point is with WiFI calling, and the fact that they both have snapdragon 600 SoC, which i believe have the WiFi, Bluetooth, LTE and so on all on the chip. so wouldnt the drivers and ways that they use wifi bluetooth gps and ect be the same? they also made a flashable zip for the HTC One and i looked at it and grabbed all the same named files from the S4, and made myself a flashable zip (i think) and im waiting for the moment that i feel like flashing a 4.2.2 rom that doesnt have wifi calling and then ill flash it.

OreBoySwaggin said:
Merely my point is with WiFI calling, and the fact that they both have snapdragon 600 SoC, which i believe have the WiFi, Bluetooth, LTE and so on all on the chip. so wouldnt the drivers and ways that they use wifi bluetooth gps and ect be the same? they also made a flashable zip for the HTC One and i looked at it and grabbed all the same named files from the S4, and made myself a flashable zip (i think) and im waiting for the moment that i feel like flashing a 4.2.2 rom that doesnt have wifi calling and then ill flash it.
Click to expand...
Click to collapse
just because they have the same hardware and some same features (wifi calling mainly) doesnt mean they are implemented in the same way. the code is completely different. Like i said before, its not as simple as comparing the two roms and seeing the differences. There are plenty of devs working on this issue, and you dont think they havent tried doing what your about to do? Your asking for a bricked phone

TheAtheistOtaku said:
just because they have the same hardware and some same features (wifi calling mainly) doesnt mean they are implemented in the same way. the code is completely different. Like i said before, its not as simple as comparing the two roms and seeing the differences. There are plenty of devs working on this issue, and you dont think they havent tried doing what your about to do? Your asking for a bricked phone
Click to expand...
Click to collapse
If at all it bricks the phone then it'll be a soft brick because all it'll do is either add or replace files. Maybe they haven't tried it before. Maybe my solution works. maybe it doesn't. Yes i know code will be different but not all of the code will be. if you can find the similar code maybe it'll help.

WiFi calling

I have a AT&T s4 but we flashed it to tmobile. Anyway to get the WIFI calling app?

eastside08 said:
I have a AT&T s4 but we flashed it to tmobile. Anyway to get the WIFI calling app?
Click to expand...
Click to collapse
If you flashed the Stock T-Mobile ROM, and have a T-Mo SIM, you should have the setting - there isn't an "app".
Go to Settings > Connections > More networks > Wi-Fi Calling Settings.
You should be able to turn it on or off and then set your preferences.
Remember it has to be a Stock ROM, none of the non-Stock ROMs support Wi-Fi calling.
Rob

rlichtefeld said:
If you flashed the Stock T-Mobile ROM, and have a T-Mo SIM, you should have the setting - there isn't an "app".
Go to Settings > Connections > More networks > Wi-Fi Calling Settings.
You should be able to turn it on or off and then set your preferences.
Remember it has to be a Stock ROM, none of the non-Stock ROMs support Wi-Fi calling.
Rob
Click to expand...
Click to collapse
Actually there is a WiFi Calling apk.
And all of my roms have WiFi Calling. And they are "Non-Stock".

The Sickness said:
Actually there is a WiFi Calling apk.
And all of my roms have WiFi Calling. And they are "Non-Stock".
Click to expand...
Click to collapse
Sorry for my spreading of misinformation. I thought I had read that it was only Stock. Is it that the ROM must be TouchWiz based? Is that the issue - so no AOSP, CM nor GPE?
As to the APK, I thought he was asking about an APP he had to run.
Again, sorry, and thanks for the correction.
Rob

Yes wifi calling is touch wiz based.

Corwinder said:
Yes wifi calling is touch wiz based.
Click to expand...
Click to collapse
Technically, its been made available for other platforms - My wife's HTC Sensation has it. But yeah, on the Samsung S4 only the TW based ROMs have it.

access9 said:
Technically, its been made available for other platforms - My wife's HTC Sensation has it. But yeah, on the Samsung S4 only the TW based ROMs have it.
Click to expand...
Click to collapse
Supposedly there will be a app on the Play Store in the future.

Can you post a link to the apk @ The Sickness?
Sent from my Samsung Galaxy S4

Also how can I apply wifi calling to a tw Ron which does not have it?
Sent from my Samsung Galaxy S4

XBlackChaosX said:
Also how can I apply wifi calling to a tw Ron which does not have it?
Sent from my Samsung Galaxy S4
Click to expand...
Click to collapse
There is no apk yet.....All US T-Mobile TW roms have WiFi Calling. Only international doesnt

I remember on my old HD2 there was a thread where Wi-Fi calling was added to CM7 and I think also on CM9. Maybe a developer can get some ideas to get it to work on aosp?
http://forum.xda-developers.com/showthread.php?t=1038784

The Sickness said:
Actually there is a WiFi Calling apk.
And all of my roms have WiFi Calling. And they are "Non-Stock".
Click to expand...
Click to collapse
do you have the apk to upload?

access9 said:
Technically, its been made available for other platforms - My wife's HTC Sensation has it. But yeah, on the Samsung S4 only the TW based ROMs have it.
Click to expand...
Click to collapse
I think what it is is that T-Mobile had the feature baked into whatever custom interface the phone manufacturer was using. With the HTC phone, it was probably baked into Sense. In the case of Samsung phones, they were baked into TouchWiz. Recently, the ability was added to iOS 8, adding recent iPhones to the capable list.
I may be wrong, but I think it was a way to discourage tinkering because they were trying to encourage people to take up expensive flagship phones. If WiFi Calling could be plastered to just any old GSM phone, the more expensive phones lose their appeal.