I have been experiencing a peculiar problem with my Galaxy S6 edge quite frequently.

Many times I try to call a person, the phone does not connect.

I have to then restart the phone and then it works.

Also, every once in a while, when I am talking to someone, the person on the other end suddenly is unable to hear me while I can hear him.

Could anyone advice me how to fix this ? Is this a SIM card issue ?

I cut the normal sim card to a micro-sim ?