Why my S6 Edge is dropping calls after 20/30 seconds?

[AC Question]

I had my S6 Edge for about a month now, from 10 days I changed my sim card from 3G to 4G. After that my phone started dropping calls.
Whenever I call someone or receive a call, the call ends after seconds
the number of seconds differ from time to time, sometimes up to 1 minute and it gives me "call ended".
I tried to call in safe mode to see if an application is causing the problem but still ...
I tried to put another sim card but still.....
I tried to change my mobile network from 4G to 3G but still
Please HELP!!!!!!!!!!!

 

[Shane English]

Settings>More networks>Mobile Networks>Choose Automatically

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