As described above. I have a jailbreaked IPhone. Whenever I receive or make a call and hang up the screen turns black and nothing works. The only thing that I can do then is to hold the power button as well as the small button below the screen for a few seconds. After this the Apple symbol appears and the phone reboots. This did not happen in the beginning, so I have the feeling it good be related to some running software. Who has the answer???? Thanks and regards, JJK Edit: Just read that jailbreaking could solve some similar problems and so I used ILiberty for the first time and it seems to work.