After being on the phone with apple for over 45 mins approximately 40 of which was spent on hold the call dropped and I was never called back! When I called the next day to continue there was NO record of my previous call. I was told to hold the phone differently - except I'm using handsfree - I'm not even touching the phone! Then I was told the remove the SIM card to "reactivate" the network! This is crazy! Has apple forgotten that this is a PHONE!!! I need to make calls without them being dropped. The signal strength is horrible. And this didn't happen with my 3G. So, back to the Genius bar tomorrow for a new phone or it's being returned. It's amazing to me that Apple is denying that there is a serious problem here. How is that so many of us could be suddenly dropping all our calls and having so poor signal strength. This really needs to be fixed.