Did that improve the overall volume (compared to when it had been working ok)? Or is it the same low volume that we are all experiencing?
Please call Apple Support and get a case number for this problem. This is the only way a mega company like Apple is going to know about the volume issue.
My receiver (slit-speaker at top of phone) on the iPhone is too low to get any use from. I called Apple and they are looking into this for me. I will post back what happens, but in the mean time if they can fix this via software, unless the folks with a problem let them know about the volume issue they will have nothing to fix to begin with.
For everyone that has a loud receiver, congrats, you get to enjoy your iPhone now.
-howard