Volte calls option DISAPPEARED

[Jagadish9999]

Why "Volte calls" option disappeared after one ui 3.1 update in Samsung galaxy M21?

[AlenSony소니알렌]

Problems persist with different service provider ithink
Which service provide are you using i mean which sim card ?

[Jagadish9999]

Jio and airtel bro.

[AlenSony소니알렌]

Try to put on airplane mode for 10 sec then turn off

[Jagadish9999]

I already tried this but no change.

[AlenSony소니알렌]

Power off device open sim tray then change sim position

[Jagadish9999]

I did this many times but no change

[AlenSony소니알렌]

Have you tried on any other phone

[AlenSony소니알렌]

Is airtel or jio has the problem

[Jagadish9999]

Yes i used both sims on poco m2 pro i got volte option on that