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You may need to do a hard reset on your phone. back up the information if you can because a hard reset will delete all of the data on your phone. Press the buttons sleep/wake and the home button. Hold the buttons for like 15 seconds. After holding both buttons, the slide to power off button appears. just ignore that and continue to hold the buttons for a few more seconds, the screen will then go blank. Continue to hold until the apple logo appears.