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If it's an S60 phone you just can enter *#7780# into the keypad and the lock code is usually 12345 unless you've changed it. Your phone will then restart on its own. If it's an S80 phone like the old communicators, you needa be quick to press the following keys: with one hand hold the Shift + Ctrl + Chr and with your other hand press I. However, before you press all these keys, take out the battery, put it back in and as soon as you do that and turn your phone on press all the above keys.