Wifi Calling Greyed Out on Samsung S7

Forum|Forum|11 months ago
September 11, 2025
6 replies
102 views

I have just bought an S7 with Android 8.0.0 unlocked, but T-Mobile splash screen

I purchased it specifically in order to be able to use WiFi Calling, as cell reception is poor where I live

The phone is listed on the iD Mobile WiFi Calling compatibility webpage, what do I need to do to enable it?

Many thanks

Best answer by WelshPaul

If a device has a T-Mobile splash screen, it means it has customised firmware for that network. This means some features of the device may not work with other networks. Additionally, since the device is 10 years old, things change over time, so it might not work even if the generic firmware is installed.

To ensure compatibility, you must use a device listed on the approved handset list.

https://www.idmobile.co.uk/help-and-advice/approved-handsets

WelshPaulAnswer

Platinum  Contributor

If a device has a T-Mobile splash screen, it means it has customised firmware for that network. This means some features of the device may not work with other networks. Additionally, since the device is 10 years old, things change over time, so it might not work even if the generic firmware is installed.

To ensure compatibility, you must use a device listed on the approved handset list.

https://www.idmobile.co.uk/help-and-advice/approved-handsets

I have no affiliation whatsoever with iD Mobile or any subsidiary companies. Comments posted are entirely of my own opinion. Did my comment help answer your question? If so, don't forget to mark the response as the Most Helpful Answer.

U

ukkid35Author

New Contributor

Thanks, I checked the ‘is your device compatible’ drop down here before purchasing, where it is listed

https://www.idmobile.co.uk/help-and-advice/wifi-calling

The two lists appear to be quite different

WelshPaul

Platinum  Contributor

Thanks, I checked the ‘is your device compatible’ drop down here before purchasing, where it is listed

https://www.idmobile.co.uk/help-and-advice/wifi-calling

The two lists appear to be quite different

The S7 is on both lists, but the issue with Android phones is that some, particularly those supplied directly by a network, come with customised firmware. This means features like WiFi calling are only compatible with the network that supplied it. To be fair, iD Mobile should add a disclaimer to both pages to inform visitors of this important detail.

You could try resetting your network settings, but if that doesn’t work, your only options are to switch to EE or replace your handset.

I have no affiliation whatsoever with iD Mobile or any subsidiary companies. Comments posted are entirely of my own opinion. Did my comment help answer your question? If so, don't forget to mark the response as the Most Helpful Answer.