I would recommend contacting your data provider.
SOURCE: my nokia N73 always memory
Just Format by using this 100000% verified..
Press and hold 3 keys i.e. Green, dial key, *, Star key, no. 3 , key on keypad and then press the power on/off to switch on the phone.Examine the battery backup of your phone. Remember, do not let go the 3 button i.e * + 3 + green just press and hold keys until you see a formatting word screen shown........But in N series don't release the three button until the time set shown . original system and factory setting has also done automatically.There is no guarantee coz it might not work with some phone.............................................Try and Enjoy
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