Why am I only able to have a phone conversation using a headset?

[iMore Question]

Updated to iOS 8.4 now I can't hear phone on phone calls. If I use speaker I can hear ,but people can't hear me. Only works if I use a headphone

 

[Just_Me_D]

Updating to iOS 8.4 didn't cause the issues you are having. More than likely, the problem is mechanical. Being that you failed to mention which particular iPhone you have, I recommend you make a Genius Bar appointment with the nearest Apple Store and have a. Genius diagnose the problem for you.