Network Issue
I have iphone 7 plus. When I receive call through mobile network I can hear the person clearly but that person unable to hear or partially hear my voice but the moment I am near any mobile tower or I switch to Phone WiFi calling or WhatsApp calling that person can hear me clearly. This issue only happens when I am too far from any mobile tower but I have iphone 6 plus also and when I am too far from mobile tower, I do not face this issue in my iphone 6 plus. What could be the issue?? How to resolve??