I have an iPhone 4 which I operated on 4.0.1 firmware for the longest but updated to 4.1 right before 4.2.1 was released by Apple. Ever since my firmware update, I have been getting this screen that says "password incorrect: enter voicemail password" after EVERY phone call or anytime I close down the phone app in multi-tasking. Mind you, I don't ever remember setting up a voicemail password since I purchased my iPhone 4. I jailbroke my phone using limera1n. Can somebody, anybody tell me what's the problem. What do I need to do to get rid of this pop up after every phone call?