No sound on Iphone 4S during calls!

[cap2587]

I have an Iphone 4S that is not functioning correctly. When I make a phone call I cannot hear the other person talking and when the iphone is ringing to the other person. It works okay with headphones, using speaker and Siri works. I did recently replace the back cover of the Iphone, therefore not sure if that has caused the problem. I did restore the software, but that did no good. What hardware issue or part of the Iphone should I check 1st. Thanks for any help.

 

[Applejuiced]

Maybe something got loose or popped out of place when you opened it.

 

[cap2587]

Thanks for the reply. I took the back cover off again and all looks fine with nothing loose or out of place. Here is what I know:

1. The problem is definitely not software as I restored the Iphone and problem still exists.

2. I bought the Iphone used and did not try and activate it straight away. Therefore I actually don't know if the sound problem was there prior to the back cover being replaced.

It is a bit of a mystery as the Iphone looks like it is in great condition. I am doubting I got duped as the guy I bough it from was not nervous as I was checking the Iphone's functionality. However, I guess I must have overlooked a key component in sound when talking. I checked music volume, but not sound during a call. Any other ideas would be appreciated.

 

[Applejuiced]

Bring it to an iPhone repair place to have them check it out. It's definitely hardware related.
Maybe Apple can look at it and tell u what's up.