I did a jailbreak on my iPhone last week. Everything went fine and I have been using the apps as well as the phone functionality without any problems until this afternoon. I went to make a call and after pressing the phone button (bottom left) the phone went back to the main screen after about 4 or 5 seconds. It keeps doing it. I cannot make any calls basically. I can receive calls and use all the other apps without any problems.
Firmware version is 2.1 jailbroken.
Any idea what could be wrong and how to solve the problem?
I have gone into settings -> General -> Reset and selected "Reset All Settings", to no avail.