Resetting your Windows phone will return it to the same state it was in the first time you turned it on. All of your personal content will be erased, and the phone will be restored to its factory settings.
If you decide to reset your phone, you can back up apps, text messages, and more in the cloud beforehand. To learn more about how this works, see Back up your stuff.
Be careful. Resetting your phone will erase all content stored on your phone, including apps and games (along with app data and game progress), text messages, call history, music, photos, and more.
If your phone is unresponsive and you can't reach Settings , you may be able to reset your phone using the hardware buttons. On Lumia phones (and some others), use the following procedure to reset your phone.
If you lose your phone, you can reset it remotely. To learn how, see Find a lost phone.
Article ID: 10768 - Last Review: Aug 31, 2016 - Revision: 19