iPhone 4S echoing...

every call i'm on phone echoes every time. else have problem? i've switched speaker phone, phone headset, turned off phone, on, restored, wiped , started scratch, etc no avail.

ideas?

 

very tight cases can cause issue. life proofs water proof case (think fixed issue.

ive got bad connections before , here echo. i've experienced since when using dumb phones. rare , calling fixed problem.

aside maybe hardware issue....

 

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