Galaxy S8 WiFi Talk & Text

Wifi calling doesn't work on my Galaxy S8 and doesn't even show up as an option in the phone's settings. Originally, it was available and did work, but after installing the November patch it disappeared from the settings menu. I was hoping the Oreo update would restore it but that hasn't been the case for me. Putting in a different sim card from either T-Mobile or Project Fi restored the option for Wifi calling but putting my Mint Sim card back in took it away again. Is there a fix for this?

My S8 is a SM-G950U, IMEI 35775408 with Android 8.0/Baseband version: G950USQU2CRB9

11 replies

I have the same situation with my Samsung Note 8 unlocked phone, originally from T Mobile. I have been using it with Mint Sim for a couple of months and everything was working fine, including the Wifi calling feature. Since installing the android Oreo 8 operation system update, the wifi calling feature is not available. Model SM-N950U
IMEI 35182409, Baseband version
N950USQU3CRC2, Android version 8.0.0. I have contacted Samsung and TMobile and both have not been able to help. Please any suggestions?
Same problem with my Galaxy S8+. Wifi Calling used to work on MintSim until after Oreo update was installed.
S8+ SM-G955U
Jack, If after the Oreo installation you were able to restore the wifi calling feature with the installation of an Tmobile sim card, and later when you re installed the mint mobile sim card, the wifi calling feature was gone, then TMobile is not the cause why we currently don't have the wifi calling feature. Right? Could it be Mint Mobile?
hsamalot, I think we all have the same situation, and this whole issue is MintMobile's fault.

In my case if I put T-Mobile simcard, reboot device - it restores WiFi Calling option, then I can switch sim card (without reboot) to MintMobile card and WiFi Calling option still available and works, so I can make calls through WiFi (but only before reboot). The problem is the "SIM card changed" notification appears in the middle of the screen and can't be hidden. Of course, after proposed reboot with MintMobile card in - takes WiFi Calling option away.

I've contacted MintMobile support regarding this matter about a month ago; here's what I've got as a reply:
"Unfortunately, the OREO is giving us issues with our network and features. Some Samsungs devices are having problems because of that update.
The Samsung Galaxy S8 Android 8.0 Oreo update is a major release and an operating system change can have a profound impact on your phone’s performance.
Samsung Galaxy S8 Android 8.0 Oreo include severe battery drain, issues with connectivity including Bluetooth and GPS, issues with apps, lag, lock-ups, and more.

We waiting for a next update that way most of the problems we having (VOICEMAIL, WIFI CALLING, and Messages) can be solved.

We are very sorry for any inconvenience."
Thank you Tony for this very good information.....
Thanks Tony - I've been banging my head trying to figure this one out. I called Mint and talked to their support only to have them tell me that the issue was my phone and that T-Mobile had locked me out of the feature. I kept trying to explain this is a provisioning issue from the Mint side. I am hopeful they can figure this out for the next update.
So here is the solution (at least it worked for me):
1. Get anywhere working T-Mobile simcard (friend etc.)
2. Put T-Mobile simcard in your phone and restart it.
3. After your phone will register on the network with T-Mobile simcard, go to "Unlock Device" app and request "Temporary unlock".
4. Reboot your phone one more time (just in case).
5. Put you MintMobile simcard back and restart the device.
After I did all described above I've got WiFi Calling option on my Galaxy S8+ back.

Let me know if it helps.
Tony: Please clarify or give us more information to this portion of your solution to restore wifi calling "After your phone will register on the network with T-Mobile simcard, go to "Unlock Device" app and request "Temporary unlock". Is this an app of the Play Store that you can temporary unlock your phone? Please let us know. Hector
I'm not sure that you can download "Unlock device" app. I think it just appears when you reboot your device with T-Mobile simcard.

P.S. As far as I remember whenever you register your android smartphone on T-Mobile network for the first time - T-Mobile locks it on their network. (I'm not sure how it works and if there any disadvantages to that. You can unlock it permanently after 30 days.)
So back to the point - as soon as you restart your phone with T-Mobile simcard for the first time - "Unlock device" app should appear in your apps. That is how it happened to me.
Great. I will try this solution when I'm able to get someone with a T Mobile sim card and will let you know if it worked for me. Thanks, Hector
So does the Tmobile sim card with the Temp unlock do the trick? If so I will try to find mi old sim or some one with a Tmobile card I can use.
If it works. I have a Note 8