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Have you ever tried to run an application on your windows phone and it takes forever just to open? Or your windows phone is messed up because you tamper with an unknown setting or consistent bugs have been making you frustrated?

So before heading to your techy to pay for your ignorance, you may try formatting your windows device. Formatting will reset your device into factory/default settings.

Here is the procedure to format your windows phone:
NOTE: Formatting will wipe all your device data in order to restore it back to its original settings

1. Switch off you phone first.
2. Press and hold the volume down button. While holding press the power button until the phone vibrates.
3. Now release the power button, while holding the volume down button for 5 seconds.
4. Release the volume down button and the phone will reboot.

CONGRATS,if you follow these above steps correctly. Your phone is now back to its factory settings. ENJOY!!

Source: http://www.tabverts.com/2015/08/simple-tip-to-format-your-windows-phone.html