Doing a factory reset on the Nokia Lumia 900 takes just a few minutes, and enables you to sell your device without worrying about your personal information being accessed by the new owner.
Here's how to reset your Lumia 900 to its original factory state:Go to Settings. Scroll down to the About listing and tap on it. At the bottom of the screen (you may have to scroll) you'll see a button titled "Reset Your Phone." Tap on it. Confirm, twice, you are sure you want to reset your device.
Your device will then reboot … Read more