SOURCE: how to format Nokia 3100?
See if you have any option call restore to factory setting or try
*#7780# (*#rst0#) Reset to factory defaults, confirmation required
(also known has a Hard-format), all phone contents will be wiped clean
including contacts and smses if they are stored on the phone
If the solution did not help please post me the message and i will look for some other options for you.
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