(Keep in mind this has been happening since 3.0 beta 4 on my 3G)) I used to own a White 16GB 3G and ever since I had 3.0 beta 4, I've had this problem. The problem is, every time I hang up from a phone call, none of the iPhone's buttons work for like 30 seconds. After I hang up, I can change the menus (ex. Favs, Contacts, Recents, etc) but I cant turn off the screen or go to the home screen. It's been doing this since 3.0 beta 4 on my 3G and now I'm currently running 3.1 Beta on my 3GS. Anyone else having this problem?