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Generally speaking the 3 network is the only one you cannot unlock. All other networks can be changed but not 3. You could try asking on the 3 site on the "contact us" link but I doubt its possible. http://www.three.co.uk/Help_Support
THE SECURITY CODE IS 12345 (BY DEFAULT FOR ALL NOKIA HANDSET) &
YOU CAN CHECK ALSO IN MOBILE HANDBOOK THOSE U R GET WITH MOBILE HANDSET
BOX.IF U WILL GET LOCK BY PUK CODE THEN U WILL CONTACT WITH YOUR
TELECOM SERVICE PROVIDER OR CHECK IN HANDBOOK THOSE U R GET WITH MOBILE