Ensure the phone is turned off . (Remove and reinsert the battery if it's frozen).
A formatting screen will appear (it may look like a grid or show the word "FORMATTING"). Release all buttons.
The phone will restart. Once it boots up, it will be as clean as when you first bought it. Method 2: Hard Reset Using Hardware Keys (For Frozen/Unresponsive Phones) Use this method if the phone is frozen, stuck on the Nokia logo, or you have forgotten your security code. How to Hard Reset NOKIA 2700 classic
A hard reset (also known as a factory reset) will erase ALL your personal data, including contacts, messages, photos, videos, and custom settings. It will restore the phone to its original out-of-the-box state. Back up any important data before proceeding. Method 1: Using the Phone Menu (Software Reset) This is the safest method if your phone is still turning on and responding.
Once you see the logo, release only the Power button . Continue holding the other three keys (Call, *, 3). Ensure the phone is turned off
Keep all four buttons held down until the phone vibrates and the Nokia logo appears.
Select Restore factory settings .
Unlock the phone and go to the Main Menu .
Scroll to Settings (the wrench icon).