Making calls

[SMMK]

Hi, when I try and make a call it either won’t even ring or it will ring and I can’t hear the person on the other end and they can’t hear me. This has been happening now for a few weeks. 

[Bambino]

@SMMK You may have a faulty sim. Can you try your sim in another phone to see if the same thing happens? If you need a new sim, best thing to do is to call into an O2 store bringing photo ID with you and they'll swap your faulty sim for a new one.

How to find help & contact O2: A Guide - O2 Community