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Normally contact service is displayed when phone security files.(RPL data which relates to IMEI No.) gets corrupted. there are 50% chance to get it repaired by reloading phone software files. his can be done using UFS-T box or ATF box (only for Nokia all models) or get it done by a service engineer
My Nokia 6233 has IMEI corrupted as told Mobile Repairing Centre. Problem is after SIM inserted no network sown and "Registration Failed" message displayed. Phone is automatic switch off after 30 sec. When I dialed *#06# Serial No. 1234561012345? shown.What should I do? Please help me.