Ensure the phone is completely powered off. If it is frozen, remove the back cover, take out the battery, wait 10 seconds, and put the battery back in. Do not turn the phone on.
From the home screen, go to Menu > Settings .
Tap Phone management > Factory settings (or Restore factory settings ). How to Hard Reset NOKIA 700
There are two methods to hard reset a Nokia 700: Use this method if the phone is frozen, stuck on the Nokia logo, or won't turn on properly.
Keep holding all four keys. The phone will vibrate and try to turn on. Do not release the keys. Ensure the phone is completely powered off
Wait 2–3 minutes. The phone will perform the reset and reboot automatically. It will boot to the initial setup screen (select language). Method 2: Using Security Code (If phone still works) Use this method if you can navigate the menus but want to erase everything.
Select Phone (or Phone Management).
While still holding those three keys, press and hold the Volume Down key as well. You are now holding 4 keys.