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Thanks for the info so soon it looks like three will enable WiFi calling across the board all phones on three. I've done all the disabling volte and vofi checks before and it's shown as available on the phone info but never been able to use WiFi calling, showed as HD when on phone calls at times though. Just checked again tried sim 1 all the same, put back in sim 2 and all greyed out now dispite disabling the checks. In the area I'm in now I do turn volte off as when on I get slow data speeds turned on as it must be connecting to a different band as blackspot area