Can't make or receive calls with my iPhone 4 - 12GB.
If i turn off my phone (or select "on the fly" mode) and then turn it on, it seems that there is just 1 bar of signal power (even in a place where the signal is always full) and my provider's name dosn't appear.Then i try to make a call to a friend. The screen looks like that the phone is trying to call, but there is no sound and the timer doesn't start even if my friend takes the call. To my iphone nothing happens and my friend can't hear a thing (the line seems dead). When i try to end the call, the end call button looks like it is pressed, but the screen stacks there. I need to press the home button to go back. When my friend is calling me, my phone doesn't do anything, but he things that it is ringing. All this time the applications are working perfectly.
The problems is solved only with reset to factory default settings (not with hard reset). After that i can make and take calls, but only until the next time i restart or put my iphone on the fly mode, when the problem reapears. The phone is fully updated and NOT JAILBROKEN.
Any ideas????
Thanks.
MacBook Pro, Mac OS X (10.6.7)
