Have u called your service provider and activated the VoLTE service?
please give number
Who.is your service provider?
ඔයාගෙ sim එක දෙන company එක මොකද්ද? That is ur service provider. You need to call them to get it fixed
Airtel call කරලා activate කරගන්න
active vela thiyenne mekata pennanne
You need to get activated volte through service provider.