Hi, you are looking at a hard reset or factory reset, please check for your phone type and model on the web, and then search it's hard reset process. Remember, that this process will delete all and reset as new. Is important to know that if you have a registered email for security on it, that you know you security password, that way you would not have any problems getting it re-programmed, and posibly able to get your personal info. back, via your registered email.
