hold down the power button and keep holding it and take the back of your phone off, take out the battery while you are still holding the power button then put the battery back in and keep holding the power button and wait for it to come on and it should do a hard reset on your phone. MAY NOT WORK but I did it on my phone and it helped and my phone was a palm treo 680 smartphone so THIS MAY NOT WORK ON ALL CELL PHONES JUST GIVING ADVICE.