Help! S6 making calls and the other end cannot hear my voice the first time, the second time is fine

[AC Question]

I have a galaxy s6 with AT&T. Since about 2 weeks ago, when I call my girlfriend I can hear her voice but she cannot hear mine, and I call her again the second call works just fine. It happens every single call between us, it's very annoying. I don't call other people very much and I will try to call others tomorrow.
Please let me know if you have any suggestion, thank you very much!

 

[B. Diddy]

Welcome to Android Central! I'd start by contacting AT&T and seeing if they can help with the issue. Maybe they need to try a new SIM card.

 

[jiaoyang5]

Thanks! I just feel it's weird because it only happens when I call my girlfriend and it works fine when she calls me.

 

[B. Diddy]

Is she on the same carrier?