Microsoft claims that Windows Phone is the most exhaustively tested mobile platform ever released. We ourselves have found the operating system really stable, but there are certain scenarios when you might want to do a factory reset of your windows phone. For example: when selling it to someone on ebay or craiglist. In such rare cases, follow these steps.
Turn your windows phone on and unlock it. Go to the program list and then to settings. Scroll to the bottom and select the text that says “about”. Tap on the button “Reset your Phone”. You will see this warning ““WARNING!
Resetting your phone will erase all your personal content, including apps that you purchased and downloaded, and will restore the factory settings. Do you want to continue ?”” Ask yourself if you really want to delete it. If yes, tap on the “yes” button.
If you were looking for information about how to soft reset your windows phone, you can find it here.