Nokia 6600 hard reset
There are 2 ways to do a factory reset on your Nokia 6600 phone. If you have forgotten the password, you should reset the phone using the hardware reset method.
The first methode is a soft-format code for Series 60 phones is *#7370# . Enter this code in the dial phone screen.
It performs a format of the Internal drive - All data will be lost! You must use a valid SIM card to enter the phone dial screen. Make a back up before doing a full reset of your 6600 phone.
Nokia 6600 hard reset using keys / buttons. Little bit difficult, but it works!
Master reset Nokia 6600
The method of performing a hard-format, i.e resetting it completely to factory defaults and removing all data, is as follows:
1. Switch off the phone. Make sure the battery is fully charged!
2. Hold down the following three buttons: Green (call answer) button, * button, and '3' button
3. While holding these buttons, press the power button and switch on the phone
4. When the message 'Formatting' appears on the screen, release all of the buttons. It will take about 2-4 minutes! Phone will reboot! Do not power off your device until phone reboots. After hard reset is done you should see "Insert SIM card" message on screen or if you have inserted SIM and PIN code enabled, then the home screen will be displayed.
Note: There is no need to insert any SIM card to do this Nokia 6600 hard reset format using buttons.