Format your device by this combination : * + 3 + call button + power button, the default lock code is 12345.
You can also try *#7370# to format the device.
SOURCE: formating code for nokia 6300
have you tried 12345?? or 00000?? thats the standard code for all phone or try the hard formatting
Switch off the phone.
Hold down the following three buttons: Green (call answer) button, * button, and ‘3′ button
While holding these buttons, press the power button and switch on the phone
When the message ‘Formatting’ appears on the screen, release all of the buttons
SOURCE: formate nokia 6300
yes you can soft format [factory reset] your phone by pressing *7730# and entering your security code[default 12345] or weather you want to HARD FORMAT, switch off your mobile phone 1st, then press and hold 3 keys at a time star key, green dial key, and no. 3 key. then switch on your phone.
do not unhold all three key's until nokia's logo come's [hand shake] . it's done. you have to select your city. mean's your phone is virus free now.
[get backup of your contacts and messeges before formatting or you will lose your data]
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