Develop Bugs

VOLTE

So I stumbled on the fact the Note 10+ has this feature out of the box a few days ago. It's not in the usual spot for Samsung for me, but when I flipped it on it worked. I've changed nothing, but it no longer turns on (reboot, airplane mode, PRL and Profile Updates. Switch goes to On, It tells me how amazing VOLTE is, but then I don't get the VOLTE symbol in the status bar and still loose data on a call.
Anyone else experience this?

Well for anyone who cares, I have a Sprint Magic Box. I've seen mixed information on it, some places stating that the older Generation units will support VOLTE and it's been rolling out since nearly a year ago, other sites stating only the Gen 3 support it.
I contacted Sprint and they seem to claim the later, that only the Gen 3 supports it. Since I have a Gen 2 they are setting up to swap me to a Gen 3.
So FYI if you have Sprint and no VOLTE, this might be why. If you have Sprint and have VOLTE on a Gen 1 or Gen 2, definitely congrats on hitting the lottery!
Only other thing I can think of is they started updating older units and had issues and stopped. I've had the Gen 2 exactly a year and a couple days.
Edit: From further reading, the magic box software that supports VOLTE is 15.15.50.514 which mine has and it does not support VOLTE. So *shrug* not sure what happened.

I have Sprint and have VoLTE
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odd, the exynos EU/UK version doesn't have a VOLTE symbol but VOLTE works fine on THREE UK out of the box.

I have the unlocked 10+, I have VOLTE on, can place calls and use internet without and issue, but no VOLTE symbol in status bar. Using Xfinity Mobile(Verizon towers).

For my brother's and sisters with an unlocked phone and on AT&T there is hope for us to get VoLTE without wonky work arounds.
I called and called and called and finally got transfered to someone who could do something. Basically AT&T will at first tell you that features like Wifi calling and HD Voice (VoLTE) are only available on AT&T certified devices aka phones you bought from them.
However what they won't tell you is that if you press them hard enough and get the right person they will add your note 10 plus IMEI number to their internal IMEI devices database that allows your phone to get all those sevices.
Now it's not instant they will advise it takes between 24-48 hours and for me it took about 30 but as I was sitting here about 20 min ago I got a notification about a carrier services update and after it applied it I had the VoLTE toggle and wifi calling toggle on my unlocked note 10 plus. I of course turned them on right away and after confirming my e911 address I had wifi calling and shortly after VoLTE started to work.
The difference in call quality between standard cellular and VoLTE blew my damn mind. It's a real shame AT&T plays these games but you can get your IMEI added and get a the features without having to flash the att firmware or do sim swaps.
I haven't tried making a video call as all my contacts have iPhones but supposedly it's enabled now too

ianmb said:
I have Sprint and have VoLTEView attachment 4812055
Sent from my SM-N975U using Tapatalk
Click to expand...
Click to collapse
With a Gen 1 or Gen 2 magic box? Otherwise you missed the point of the thread entirely.

Now if they could just enable VoLTE on the Galaxy Watch...

mikey_sk said:
odd, the exynos EU/UK version doesn't have a VOLTE symbol but VOLTE works fine on THREE UK out of the box.
Click to expand...
Click to collapse
The UK version from Samsung does have the symbol, I changed fro EE to 3 over the last couple of days, when I was on EE I got the volte symbol but on 3 I don't, so while the option enables I'm not sure it's actually working. But the same is true with EE I always had 4G+ but on three I only get basic 4G.

Belimawr said:
The UK version from Samsung does have the symbol, I changed fro EE to 3 over the last couple of days, when I was on EE I got the volte symbol but on 3 I don't, so while the option enables I'm not sure it's actually working. But the same is true with EE I always had 4G+ but on three I only get basic 4G.
Click to expand...
Click to collapse
I can confirm VOLTE and WiFi calling works perfectly on three. When u place a call the 4g symbol remains as 4g which is basically a VOLTE call.

edstreiff said:
For my brother's and sisters with an unlocked phone and on AT&T there is hope for us to get VoLTE without wonky work arounds.
I called and called and called and finally got transfered to someone who could do something. Basically AT&T will at first tell you that features like Wifi calling and HD Voice (VoLTE) are only available on AT&T certified devices aka phones you bought from them.
However what they won't tell you is that if you press them hard enough and get the right person they will add your note 10 plus IMEI number to their internal IMEI devices database that allows your phone to get all those sevices.
Now it's not instant they will advise it takes between 24-48 hours and for me it took about 30 but as I was sitting here about 20 min ago I got a notification about a carrier services update and after it applied it I had the VoLTE toggle and wifi calling toggle on my unlocked note 10 plus. I of course turned them on right away and after confirming my e911 address I had wifi calling and shortly after VoLTE started to work.
The difference in call quality between standard cellular and VoLTE blew my damn mind. It's a real shame AT&T plays these games but you can get your IMEI added and get a the features without having to flash the att firmware or do sim swaps.
I haven't tried making a video call as all my contacts have iPhones but supposedly it's enabled now too
Click to expand...
Click to collapse
I've been on the phone with them (AT&T) for the last 4 hours! They had the WIFI Calling working, but when I called back about the video calling and VLOTE they screwed my Wifi Calling back up. They went on to tell me about how my IMEI isn't showing up as a Note 10, but some other device named Nubia or something. I know it can be done, because I had it done with my Note 9. I had enough for today, I'll try again tomorrow!

edstreiff said:
For my brother's and sisters with an unlocked phone and on AT&T there is hope for us to get VoLTE without wonky work arounds.
I called and called and called and finally got transfered to someone who could do something. Basically AT&T will at first tell you that features like Wifi calling and HD Voice (VoLTE) are only available on AT&T certified devices aka phones you bought from them.
However what they won't tell you is that if you press them hard enough and get the right person they will add your note 10 plus IMEI number to their internal IMEI devices database that allows your phone to get all those sevices.
Now it's not instant they will advise it takes between 24-48 hours and for me it took about 30 but as I was sitting here about 20 min ago I got a notification about a carrier services update and after it applied it I had the VoLTE toggle and wifi calling toggle on my unlocked note 10 plus. I of course turned them on right away and after confirming my e911 address I had wifi calling and shortly after VoLTE started to work.
The difference in call quality between standard cellular and VoLTE blew my damn mind. It's a real shame AT&T plays these games but you can get your IMEI added and get a the features without having to flash the att firmware or do sim swaps.
I haven't tried making a video call as all my contacts have iPhones but supposedly it's enabled now too
Click to expand...
Click to collapse
AT&T says there is no way to get that at all.

it's possible
razieltov said:
AT&T says there is no way to get that at all.
Click to expand...
Click to collapse
I had to call in a number of times before I finally got someone who knew what to do. They have a BYOD device program and getting the IMEI added is part of that program.
I am running the unlocked firmware, with AT&T service and I have all advanced features like VoLTE and Wifi calling.

edstreiff said:
For my brother's and sisters with an unlocked phone and on AT&T there is hope for us to get VoLTE without wonky work arounds.
I called and called and called and finally got transfered to someone who could do something. Basically AT&T will at first tell you that features like Wifi calling and HD Voice (VoLTE) are only available on AT&T certified devices aka phones you bought from them.
However what they won't tell you is that if you press them hard enough and get the right person they will add your note 10 plus IMEI number to their internal IMEI devices database that allows your phone to get all those sevices.
Now it's not instant they will advise it takes between 24-48 hours and for me it took about 30 but as I was sitting here about 20 min ago I got a notification about a carrier services update and after it applied it I had the VoLTE toggle and wifi calling toggle on my unlocked note 10 plus. I of course turned them on right away and after confirming my e911 address I had wifi calling and shortly after VoLTE started to work.
The difference in call quality between standard cellular and VoLTE blew my damn mind. It's a real shame AT&T plays these games but you can get your IMEI added and get a the features without having to flash the att firmware or do sim swaps.
I haven't tried making a video call as all my contacts have iPhones but supposedly it's enabled now too
Click to expand...
Click to collapse
Can ou provide several screenshots of proof you have it On? and what are the steps you have to mention to the customer service or their technician?

TechGoon954 said:
I've been on the phone with them (AT&T) for the last 4 hours! They had the WIFI Calling working, but when I called back about the video calling and VLOTE they screwed my Wifi Calling back up. They went on to tell me about how my IMEI isn't showing up as a Note 10, but some other device named Nubia or something. I know it can be done, because I had it done with my Note 9. I had enough for today, I'll try again tomorrow!
Click to expand...
Click to collapse
i am on an unlocked samsung note 10 plus, i flashed userdata from AT&T and i have wifi calling working but i dont know about video calling or volte. i dont see a volte toggle but is that the only way to confirm? not sure about video calling..i dont have anyone i know who has a device with video calling on att? suggestions? how can i confirm if VOLTE is working?

mikey_sk said:
I can confirm VOLTE and WiFi calling works perfectly on three. When u place a call the 4g symbol remains as 4g which is basically a VOLTE call.
Click to expand...
Click to collapse
Wow! I never realized this. I tested what you said and I can be on a call and the 4G symbol stays active, so I assume I am using VOLTE as well?
Oddly, I do not have an option in the Mobile networks to turn on or off VOLTE. I'm using a Sprint purchased, unlocked Note 10 plus on MetroPCS.

sammad1 said:
Wow! I never realized this. I tested what you said and I can be on a call and the 4G symbol stays active, so I assume I am using VOLTE as well?
Oddly, I do not have an option in the Mobile networks to turn on or off VOLTE. I'm using a Sprint purchased, unlocked Note 10 plus on MetroPCS.
Click to expand...
Click to collapse
Great so it's working. In the UK they don't have a symbol saying VOLTE the icon remains as 4G on a call same in Japan and Korea. Sometimes it may say HD by the mins and sec call timer

mikey_sk said:
Great so it's working. In the UK they don't have a symbol saying VOLTE the icon remains as 4G on a call same in Japan and Korea. Sometimes it may say HD by the mins and sec call timer
Click to expand...
Click to collapse
Correct, I get the "HD+" next to mins and sec like you said. Just don't have the option and do not see VOLTE anywhere. I'm perplexed why some have the option to toggle VOLTE under connections, and some do not. But I guess the important thing is it's apparently working

sammad1 said:
Correct, I get the "HD+" next to mins and sec like you said. Just don't have the option and do not see VOLTE anywhere. I'm perplexed why some have the option to toggle VOLTE under connections, and some do not. But I guess the important thing is it's apparently working
Click to expand...
Click to collapse
It's an unlocked non carrier device and the USA networks are well known to behave in odd ways such as compelling Samsung to make carrier specific software and bloat on devices. Maybe its to do with that. Most global GSM networks are significantly more 'chilled' that the USA networks. Its quite laughable in some ways

Note 10+ newbie here. I have a MOW N975F which is unlocked, but not the unlocked US version from Samsung.
I came from a Note 8 and on that phone I had called them and given them an IMEI of a real ATT sold phone and upon reboot, I got the Volte toggles, but no WiFi Calling toggle and video calling does not work on the Note 10.
So when I switched the SIM to the Note 10, I too get the 4G icon instead of the 4G-LTE like on the Note 8 previously. Volte seems present, but Video calling does not work on the Note 10. It tires to place a call and quickly terminates with some kind of network error.
I did not yet attempt to call T again and have them change to the Note 10+ IMEI under their BYOD program.
I am wondering if anyone has come up with a method to get the real AT&T CSC? On my Note 8, someone pointed me to CSCSelection_S7_S8_V1.2.5_Note 8.zip and that worked perfectly. Seems there is no more OMC directory on the Note 10 and the above did not do anything.
Might there be a way to flash through ODIN the AT&T CSC stuff from a T ROM?

how to get VOLTE and wifi calling on 975F on ATT in US

I have the dual SIM. Was having a horrible experience on calls in the US, and I noticed device dropped to H from LTE as soon as I made a call, and wifi calling wasn't working.. Also got v choppy data.
I spoke to ATT and it took a while but I explained the issue, gave them ONE IMEI only, and asked them to register it so I could get VOLTE and wifi calling.
It took 2 weeks to get a response. I just got an email saying they had resolved the issue. Meantime NO CHANGE in my service ...
...Until ...
I put my sim in an iPhone and registered for WIFI calling. That was the missing link, the thing that I couldn't do on my Note 10! Get it to register the way ATT likes it.
Once I got the confirmation on the iPhone, I put the sim back in my note 10 and now I have VOLTE, WIFI calling and my data speed has improved significantly.
So it's fixed.
(BTW I did a speed test and iPhone still consistently got better data speed, but that is probably because the F doesn't have band30)
I hope this helps someone out there!

ekerbuddyeker said:
I have the dual SIM. Was having a horrible experience on calls in the US, and I noticed device dropped to H from LTE as soon as I made a call, and wifi calling wasn't working.. Also got v choppy data.
I spoke to ATT and it took a while but I explained the issue, gave them ONE IMEI only, and asked them to register it so I could get VOLTE and wifi calling.
It took 2 weeks to get a response. I just got an email saying they had resolved the issue. Meantime NO CHANGE in my service ...
...Until ...
I put my sim in an iPhone and registered for WIFI calling. That was the missing link, the thing that I couldn't do on my Note 10! Get it to register the way ATT likes it.
Once I got the confirmation on the iPhone, I put the sim back in my note 10 and now I have VOLTE, WIFI calling and my data speed has improved significantly.
So it's fixed.
(BTW I did a speed test and iPhone still consistently got better data speed, but that is probably because the F doesn't have band30)
I hope this helps someone out there!
Click to expand...
Click to collapse
Thank you ever so much! I had to go a slightly different way, but I got Volte working.
First, I had to call the nice ATT Agents a couple of times. I finally got hold of an agent that knew how to do this. Even though I previously had an international Note 8 working, the ATT system had the IMEI of the new Note 10 plus.
I gave her an IMEI of a real AT&T Branded Samsung Note 8 I no longer used and she pushed it into the AT&T Systems for me.
I did not have a Iphone to activate WiFi calling on, but I then stuck the SIM into an old Note 8 that had previously worked with Volte but would not anymore. After booting, I was again able to active wifi calling. That seems to be the key.
I moved the SIM back to the 975F which was still configured on SIN (Singapore). For some reason, the Camera on phone contacts were no longer present! ARGH!!!!!!!!!!!!! It was previously present on contacts which indicated that Volte was not working. I changed the CSC to BTU where it also showed up and rebooted. Not joy - no Volte
So I extracted the ATT CSC file from CSC_OMC_OYN_N975UOYN2ASJ8_CL16989516_QB26837495_REV00_user_low_ship_MULTI_CERT.tar.md5. I then ran it through lz4.exe to uncompress it, and SVAImgUnpack to unpack it, and was able to access the contents using ext2explorer.exe
I copied the OMC directory from that partition to the SD card of the phone.
On the phone, I then used Total Commander to copy the omc/single/ATT directory directly to /product/omc/single/ATT - just that one CSC.
Then then copied the /efs/imei/mps_code.dat to the SD card. I then edited the SD card copy of mps_code.dat and change the content to just the three characters ATT. I then copied the file back from the SD card to /efs/imei.
Reboot, and walla! Volte worked (the camera showed up under contacts that have Volte cabability. Wifi-calling then appeared under settings. I was able to enable wifi calling on the 975F perfectly.
All good!
I hope this may help other ATT customers.

@ekerbuddyeker, Do you still using ATT network with N975F (Note 10 International model) ?
My company HQ in USA, so I frequently contacting to US HQ guys with ATT Wifi calling. (using Google Pixel 3)
I've Note8 International(N950F) model and I want to ATT Wifi calling via this Note8 device.
I checked that this Note8 / Android9 support T-mobile US and another many Carreir/country(Vodafone, Beeline-Russia) wifi calling enabled by this phone.
If your N975F has still VoLTE and VOWIFI works smoothly on the ATT netowrk , Can you share the screenshot of ATT's VoLTE and VOWIFI working?
Your guide saying, First Wifi calling provision on the iPhone then put the SIM back to Samung Galaxy device,
I followed your direction, But no luck.

Can't connect to mobile network.

I have a pixel 3xl, up to date stock non rooted, on straight talk lte/cdma Verizon network. I got a text saying straight talk now has VoLTE so I tried to find it in settings but there's no option for it. When I search it it comes up but when I click it it goes to mobile settings and it's not there I did the *#*#4636#*#* and it's also grayed out there. I changed the network mode in that diag screen to lte/cdma to see if that helped, was on global before i think. Still no VoLTE and for some reason I can't make calls. I have data, can send and receive texts but when I go to call it says no network. Removed Sim card didn't fix it, restarted it. Safe mode doesn't help either. Tired clicking trigger carrier provisioning, updated the smsc. Change mobile network to lte only, back to global, lte/cdma. I have no idea what else to try. Straight talk is basically useless for customer service so I haven't even tried yet lol.

Update!! It works!! Somehow I either damaged my sim card when I switch from my pixel 2xl to this 3xl and it somehow lasted till now. Or when I changed my network settings something wrote to the sim?( And it messed it up?? IDK much about how the phone and sim interact with each other)... But I did have a 2 year old sim card, it did not have VoLTE or wifi calling capabilities I now realize. So I bought a new SIM card at Walmart and activated it though the straight talk app on my account and kept the same number. Works perfectly and I now have VoLTE, no wifi calling yet but the option is now there and lets me click it but it fails. Doesn't matter to me, I'm just happy to have VoLTE. I'm leaving this post because straight has horrible customer service and I could find anyone who ran into this specific issue.

LG G710ULM UNSUPPORTED VoLTE ?!? (Straight-Talk US - T-Mobile network)

*********UPDATE********** I bought a new sim from straight talk and VOLTE works now! (GSM compatible Straight Talk Sim card) My old sim was from 2014, so it wasn't VOLTE compatible.
I have an ebay zombie LG G710ULM flashed to latest Google Fi Android 9 software, I received an email from Straight Talk (Wal-Mart US cell phone service reseller) telling me that my LG G7 does not support VoLTE and my phone will be unable to receive calls in January 2021.
-Using a network info app, the app is telling me it is connected to T-Mobile towers (so I have a Straight Talk T-Mobile compatible SIM)
-I can't find any options to enable VoLTE in settings, and wifi calling is erroring out
I was wondering if there are ways to get VoLTE and Wifi Calling working (Straight Talk supports it, but not my current ROM/SIM).
I can switch to the following sims supported by Straight Talk.
-AT&T Compatible Sim
-Verizon Compatible Sim? If my phone supports CDMA bands
OTHERWISE MOST OF US WILL HAVE A PAPERWEIGHT IN 2021!!!!!!!!!

Same problem
I'm having the same problem. Any progress on this?

I'd like to know this too. Surprised there is no traffic here with all the knowledgeable people on this forum.
G710EAW here. BTW There was an Android 10 update just two hours ago from Android 9. Someone with an 'EM' phone in another thread said VOWifi is "working now" but how do others know if it's working when January 1st comes around?

Falkentyne said:
I'd like to know this too. Surprised there is no traffic here with all the knowledgeable people on this forum.
G710EAW here. BTW There was an Android 10 update just two hours ago from Android 9. Someone with an 'EM' phone in another thread said VOWifi is "working now" but how do others know if it's working when January 1st comes around?
Click to expand...
Click to collapse
If you guys have cross flashed roms, then volte will not work. It doesnt work for any of us who have crossflashed. Whichever model.
You need to be on original software. Looks like some licensing thing that volte requires. They need to provision volte for all the phones. Sounds like they are not interested to provision it for g7. Odd that even EAW model which has original firmware, they sent that mail too....
Sad/Odd to see your carriers are suddenly changing to only Volte.

Is there a way to put it back to original software? I actually don't need it crossflashed to anything because it's a Verizon originally and I would like to use it on that network. Or does it not work that way?

Turnhoo said:
Is there a way to put it back to original software? I actually don't need it crossflashed to anything because it's a Verizon originally and I would like to use it on that network. Or does it not work that way?
Click to expand...
Click to collapse
Main issue is that your carriers dont want to provision volte for your G7s. So no guarantee if cross flashing back to original will work.
There is crossflashing guide in guides section with which you can go back to stock firmware. Do this at your own risk.
In our country we have a volte carrier called Jio. They provide an app called jiocall. Using that app you could use their service even if your phone is not volte capable. You will have to see if there are such apps for your carrier. Thats the only non technical, simpler solution.

I have some information that might make all of you guys happy.
I was told by Safelink Wireless that VOTLE is a function of BOTH the phone *AND* the sim card.
Basically, if the phone itself is VOLTE compatible but the sim card is not, then the phone will be reported on their system as not compatible, and will ask you to upgrade your phone.
However if a VOLTE compatible SIM is inserted, if the phone does in fact support VOLTE, it will then work. That's because it's provisioned on the carrier via the sim card itself.
If you purchased a sim via the "Buy your own sim" package, e.g. online or from Best Buy, etc, awhile ago, then that sim is not compatible. You simply need to call Tracphone/Safelink and ask to buy a VOLTE compatible SIM (which costs 99 cents). Then when you get it, call their tech department to have them transfer the phone service and phone number to the new SIM.
You can dial the phone's service menu and go to the VOLTE/GPRI menu and if the options are there, then the phone supports it.

What's the correct service menu number for our phones?

Falkentyne said:
I have some information that might make all of you guys happy.
I was told by Safelink Wireless that VOTLE is a function of BOTH the phone *AND* the sim card.
Basically, if the phone itself is VOLTE compatible but the sim card is not, then the phone will be reported on their system as not compatible, and will ask you to upgrade your phone.
However if a VOLTE compatible SIM is inserted, if the phone does in fact support VOLTE, it will then work. That's because it's provisioned on the carrier via the sim card itself.
If you purchased a sim via the "Buy your own sim" package, e.g. online or from Best Buy, etc, awhile ago, then that sim is not compatible. You simply need to call Tracphone/Safelink and ask to buy a VOLTE compatible SIM (which costs 99 cents). Then when you get it, call their tech department to have them transfer the phone service and phone number to the new SIM.
You can dial the phone's service menu and go to the VOLTE/GPRI menu and if the options are there, then the phone supports it.
Click to expand...
Click to collapse
Update, I recently bought a new sim and I have VOLTE right now on ULM android 9 latest security fix LG G7 image, running on Straight Talk.

took a while to understand lgup but my 710 oulm had a type oreo that the guy said couldnt be but i crossed flashed it to 10 i dont see the rom anymore and i hope i put it on another drive it was a canadian rom for android 10 works great otherwise im looking to get volte active in the *#*#4636#*#* phone menu you can see "provision for the setting under the radio on off but its a grey area the buttons dont work could be good could be bad its definately part of 10 but ?? grey areas preferred network could be sketchy to play with the phone initially on transition had incredible link up speed now its giving me a pain because assume i played with the connection preferences tab and its a registration error like dum just use the assigned sim guys and stop trying to mac or identify with every device anyway its the registration of a telephone number robo heads

Question Realme Gt Master Edition VoWifi dont work?

Realme Gt Master Edition VoWifi dont work?

gfpeti2 said:
Realme Gt Master Edition VoWifi dont work? PLease help, Thanks !
Click to expand...
Click to collapse
it depend on your sim card carrier

I have been looking for that information, thinking about getting this phone to use T-Mobile USA GSM voLTE? is this phone compatible?

@ryantek No, it's not. I have been using Gt Master in Mint Mobile (which is T-Mobile MVNO) for 6 month and no VoLTE, no VoWifi. I could use mobile data, but even this was not very good, often gets stuck to 3g network, though GT Master supports most of the LTE bands used by T-Mobile (except for B71 600Mhz).
I had two long chats with Mint Mobile customer service, no resolution.
I believe it's gonna be even harder to activate it after July 1st, when T-Mobile will shutdown it's 3G network. Mint Mobile didn't make me any problems to buy and activate service, but now constantly bugs me to replace phone for compatible with their network.
I've also tried it with US Mobile (T-Mobile network), Boost Mobile (ATT) and couple others. The same effect.
Save yourself some trouble and buy phone that's on compatibility list: Oneplus, iPhone, Samsung or Motorola.
I bought Galaxy S22 and now use it as my main device in Google FI. GT Master still have active Mint Mobile simcard until 3rd of June, but after that it will be over.

Hi,
Thank you for sharing all of this information. It is sad to see the carriers in the USA do not support this phone. Sadly I will stay away until anyone can confirm a phone of this brand that works with VoLTE (Tmobile).
Once again Thank you.

ryantek said:
Hi,
Thank you for sharing all of this information. It is sad to see the carriers in the USA do not support this phone. Sadly I will stay away until anyone can confirm a phone of this brand that works with VoLTE (Tmobile).
Once again Thank you.
Click to expand...
Click to collapse
Set up VoLTE and VoWiFi via QPST and the ( advaced pdc tool PDC ) Root is required. This option works in stock. You need to try several "choose" profiles, one will definitely go
In custom rom, if it doesn't work, just back up the EFS partition (after editing in stock rom) and restore it later in custom rom

I see. Wondering is there is a signed ROM with VolLTE enable out of the box.

Today I tried Google Fi simcard with my Realme GT Master (normal not modified ROM) and it worked!! VoLTE is working and so is VoWiFI (I think). I'm not 100% sure about VoWifi. I have icon of VoWifi during call but I can't make call just on WiFi while on Airplane Mode, I have to turn off Airplane Mode or it doesn't allow me to make a call.
Google Fi was activated with Galaxy S22 few months ago.
I'm not gonna test it for long, because I use Galaxy S22 as my main device now and in few days I'll move to US Mobile/Verizon, but Google Fi is usable. I still can't recommend buying GT Master for US: too much hassle, too many unknowns.

nndn said:
Today I tried Google Fi simcard with my Realme GT Master (normal not modified ROM) and it worked!! VoLTE is working and so is VoWiFI (I think). I'm not 100% sure about VoWifi. I have icon of VoWifi during call but I can't make call just on WiFi while on Airplane Mode, I have to turn off Airplane Mode or it doesn't allow me to make a call.
Click to expand...
Click to collapse
so basically you don't know which network you were on while VoLTE started to work? Google FI uses all three networks and switches them dynamically

As far as I know Google Fi uses two networks: Tmobile and Us Cellular. As I'm in western Massachusetts and US Cellular doesn't have coverage here, I'm pretty sure I got connected to T-Mobile. But I can't confirm it with 100% certainty.