I have a jailbroken 8GB apple iphone.
When i ring someone, i cannot hang up the phone, when i take the phone away from my ear, there is a black screen. I am definitely not blocking the sensor either.
Also, when pressing the green phone button, the keypad comes up on the screen but freezes, and so i cannot access favorites, use the keypad, access recent calls etc it then just automatically goes back to the home screen after a few seconds.
I have tried resetting the phone but this did not work, i have also tried swithing it on and off but ti no avail.

Any suggestions?

Thank you