I've gotten my iphone since launch day and have had issues hearing the other party on a call. When i set the volume to maximum, i can barely hear the other party - it seems like they are speaking from the other end of the room! When i reduce the volume by a notch or 2, they still sound very soft. However, when i use the headphones, they sound perfectly ok. Doesn't seem like an antenna issue, maybe a speaker issue? Anyone have the same problem? Thoughts? Thanks!