iPhone 4s Call Volume Too Low
So all of a sudden the call volume on my iPhone 4s has dropped to just a whisper. This happened this weekend unexpectedly. I have checked the forum for similar issues but not found anything that is applicable since
A) I don't have the plastic cover on the front or anything else blocking the speaker on the front.
B) I have tried to increase the call volume while in a call without success.
C) I have had the phone for months without any call volume issues
The only solutions right now are to use an earpiece or put calls on speaker (which I can't do at work). I have tried a hard reset and that did not help. Tonight I will try a reinstall from a previous backup to see if that helps.
Any other suggestions?
iPhone 4S, iOS 5.1