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.
While still holding those three keys, press and hold the Volume Down key as well. You are now holding 4 keys. 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. Ensure the phone is completely powered off