How to format n72 cellphone not memory card only cellphone?

How to Format Nokia N72 & NSeries Mobile Phones. Method 1: Three Finger Reset for Nokia Phone 1. Switch off your Nokia phone.
2. Hold down the following three keys, Green (call answer button) * Key, and Number ‘3? key.
3. While holding these buttons, press the power button and switch on the phone.
4. Wait for message ‘Formatting’ to appear on the screen and release all keys once you see that message.
Method 2: Hard Format of Nokia Mobile Phone 1. Switch off your Nokia phone
2. Now Press following key sequence *#7370#
3. Enter Default lock code is 12345.
4. While holding these buttons, press the power button and switch on the phone.
5. Wait for message ‘Formatting’ to appear on the screen and release all keys once you see that message.
Method 3: Soft Reset of Nokia Mobile Phone 1. Switch off your Nokia phone
2. Now Press following key sequence *#7780#
3. Enter Default lock code is 12345.
4. While holding these buttons, press the power button and switch on the phone.
5. Wait for message ‘Formatting’ to appear on the screen and release all keys once you see that message.
Please Note: The Above Nokia Phone Formatting method will erase all your Phone data. So do backup before proceeding for Formatting