I have a S7 from optus on a plan.
So while i was travelling to India last year and I had to use VoLTE(Network provider:JIO) If i didnt have VOLTE, I was not able to make phone calls, only mobile data( i had to use a shitty app which never worked).
I was not able to use it and didnt even have an option on the phone's setting to activate the VoLTE . It was flagship phone and i know for a fact it did have Volte when i was using it with Optus at home.
So my question is, Why it did not have Volte when I reached India and Would the same issue happen if i get another phone like S9+ or Note 9 or S10 from kogan or mobiciti ? What can i do to activate Volte?
I contacted Optus then and they said they dont know why and cant help me :(
Any experts here?
Thanks in advance