IPhone 4 phone/contacts app keeps crashing

Whenever I try to open the contacts or phone app, it keeps crashing and goes back to the springboard. I did everything from turning the phone off and hard reset. It still does the same thing. My phone is running on iOS 5.0.1 and it is jailbroken unlocked with Gevey Sim.

Sometimes jailbreaking can be glitchy and unpredictable. I would try backing up and restoring your device, then loading all your apps on but not jailbreaking or unlocking, then try and see if it does it. If it doesn't, you know it's the jailbreaking. If it doesn't, then I don't really know.

Try to restore the device back to factory settings,
then if the problem still persists then contact the responsible authorities.

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