Q: Why is the phone silent during voice calls only?

Hi there nificent,

I see that you may be having some issues with audio during calls on your iPhone. Here is an article for you that will help you troubleshoot this issue:

If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support

http://support.apple.com/en-us/HT203800

Thanks for using the Apple Support Communities!

Cheers,

Braden