When using symbian60 v1 based phone such as nokia 7650, 3650 or N gage models these two key sequences can be entered in the same way you dial up a phone number. The phone will prompt you to enter a security code (12345 by default).
On the latest S60 phones you can try a Deep Reset, using the following steps
Turns off the phone
Press simultaneously on the green/talk, 3 and* keys and hold the 3 keys.
Turn on your phone
Wait for the onscreen Format message then can release the three keys
This method may also work for Nokia phones that won’t turn on.
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