said by scots :

I'm not having any problems with mine. I did have the keyboard lag, but that seemed to go away after the last updates. I've never had an app crash on me or the phone restart, and no issues with 3G reception. Most places around town I have a full 3G signal, with the exception of in my office which is partially underground and cell phone reception sucks in general in "the dungeon". I've had several different 3G phones with AT&T, and the iPhone 3G is the first 3G phone I've used that hasn't dropped any calls. All the other 3G phones I've used had dropped calls left and right.