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Wifi Calling Greyed Out on Samsung S7

  • September 11, 2025
  • 6 replies
  • 44 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

6 replies

WelshPaul
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  • Answer
  • September 11, 2025

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


  • Author
  • New Contributor
  • September 11, 2025

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
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  • September 11, 2025

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.


Tyler C
iD Mobile Employee
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  • iD Mobile Employee
  • September 11, 2025

Hey there ​@ukkid35, we hope the kind advice from ​@WelshPaul was able to help.

 

Please let us know if any further questions.

 

Thanks,

Tyler


  • Author
  • New Contributor
  • September 11, 2025

I have now tried the S7 with a SIM card from another network that has Wifi Calling enabled, and still the phone has the function greyed out

Therefore I have given up on this phone


Tyler C
iD Mobile Employee
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  • iD Mobile Employee
  • September 11, 2025

Sorry to hear that ​@ukkid35.

 

We hope a new device will help.

 

Thanks,

Tyler