How to Reset a Phone Back to Factory Settings

Resetting a mobile phone back to factory settings completely erases all of the data on the device. Pictures, emails and music will be erased during the reset. Applications and ringtones added to the device also are erased. If you are returning the phone to the store or giving the device away, erase the data on the phone. Any information left on the phone can be accessed by anyone in possession of the device. Although the procedure varies by phone, most mobile phones can be reset back to factory settings by accessing the security settings on the phone.

...
Resetting a phone to factory settings may be necessary for a phone that is malfunctioning.

Step

Press the “Menu” key and select “Settings.”

Step

Scroll through the options using the “Up” and “Down” arrow keys. Select “Security.”

Step

Select “Reset Phone” to completely erase all of the data on the phone and reset it back to factory settings.

Step

Wait for the phone to power back on. Most phones need to perform a restart to complete the reset.