I just recently purchased my iPhone and the first thing I did was use iTunes to upgrade to 1.1.2. After doing so, I made my first phone call and the speaker volume was/is so low that I can barely hear the other person. I never made a call before I upgraded so I'm not sure if it was the upgrade or not. Does anyone know what may have caused this or what my next step should be? Any help would be greatly appreciated, thanks.