I've had this happen, it's not jailbreak related, the phone thinks you still have something plugged into the headphone jack. Plug something in and unplug and see if that fixes it, repeat until it works.
I've had this happen, it's not jailbreak related, the phone thinks you still have something plugged into the headphone jack. Plug something in and unplug and see if that fixes it, repeat until it works.