Here is a fix that I would like to pass along. My wife's iPhone 4 was dropping just about every call. It wasn't an antenna issue, it was a proximity sensor issue where during a phone call the screen would come back on and she would hang up with her face or go into other menus.
Apple's latest update (4.1) has a proximity sensor adjustment to make it more sensitive so that the screen stays off much better. If you get this issue check your version first through the settings app and update your phone if you are behind. We searched the net and nothing about an update came up so we wasted the entire day in the Apple store for them to tell us to update the phone Hopefully this can help save time for others.
Apple's latest update (4.1) has a proximity sensor adjustment to make it more sensitive so that the screen stays off much better. If you get this issue check your version first through the settings app and update your phone if you are behind. We searched the net and nothing about an update came up so we wasted the entire day in the Apple store for them to tell us to update the phone Hopefully this can help save time for others.