I have the same problem with my Moto X. Happens on every call - caller can't hear me and I can't hear them, unless I turn on speaker phone.
It happens both with the case on and off.
No damage to phone or jacks.
It seems to maybe be a software issue? The speakers work for listening to music and for voice to text.
Abigail_1 that is a great phone. We want you to be able to take full advantage of it. When did this first begin? Were there any recent changes to the phone like a software update or new apps?
Follow us on Twitter @VZWSupport
If my response answered your question please click the �Correct Answer� button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!