I have just recently got a sim only contract with bt. I have a Samsung s21 5g I have WiFi calling enabled and volte enabled my WiFi calling works but my volte doesn't if I make a call my signal drops from 4g to h+ or even 3g has anyone had this problem and is there a fix. my s21 is unlocked and my WiFi calling works its just my volte that doesnt. I have contacted the technical department over the phone but there saying because my calls are working there isn't an issue ? Any help or info appreciated.
On my Samsung phone (not an s21), in Settings/Connections/Mobile networks there is a switch to choose "Use LTE data networks for calls whenever possible"