Problem with receiving, making calls and with voice messages

[WamanT]

I have problem with receiving making calls also with voice mail. My mobile phone is 4G so could you please tell me for what reason three stoped receiving making calls?, only can receive and making calls only on WhatsApp and messenger 

[PeteG]

Hello there. 

That's disappointing to hear. What make and model of phone are you using? Where did you get it from? 

Pete.

[woodnth]

I think you will find that many owners of "4G" phones lost service when 3G was switched off. The usual explanation is that they are not the "right type" of 4G phones and cannot use VoLTE. Looks a rather messy situation, but no one seems in a hurry to intervene.