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open up your phone you'll need phone screw here.than you can check keypad connector,clean up with an pencils eraser(its safety) usually keypad or keypad light problem because off dirty connector.good luck.
Turn your device off.Remove SIM card and MMC card (actually, you do not need to remove these, but after format remember to format memory card and reboot phone). Press and hold 3 keys; Green dial key, * Star key, no. 3 key on keypad Together. Turn your device on while you are pressing the three buttons. You should now see "Formatting .." on the Screen! Leave the buttons now. all thedata on the phone will be deleted.
turn off your phone first then hold this buttons at the same time..power button, 3,*,call button... the call button is the green button on your keypad.. wait until the formatting msg will appear in the screen of your 6600..hope this will help you
Hi You can reformat your unit.. just follow this instructions. just off the fone then, press together the key no. 3 Astiris and phone in.. press in sustained position then turn on the power switch then you can see your fone is starting to refurmat... To Unlock your Unit...