I have been calling people today and each one says they can hardly hear me. I can hear them though as normal. I used the phone for calling a few days ago and everything was fine. None of my settings have been changed. I just did a factory reset and it is still the same. I have an iPhone 5s and it is only a few months old. I know it's not a issue with the network because I tried my daughter phone and people can hear me on that one just fine.