1)Make sure battery is fully charged atleast 70 to 80 %.
2)Take back up of all important data like contacts list and personal files.now
3)Switch-off your 6600 phone.
4)Press and hold these 3 keys at the same tome;
Green dial key, * (star key) & no. 3 key
Then press the power on/off to swtich on the 6600 phone.hold all pressed keys until you see a formatting word screen show!
5. After a few minutes when your nokia phone’s full formatting completed, your 6600 will back to original system and factory settting.
All apps installed and data will not available you need to install everything except default applications.
Now restore your back up.
This is Work with all devices. here is link for nokia unlock codes.
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