Hi.
There is a way for you,on your own end, to reset the system of the unit which is a format procdure already.remember all info in the phone memory will be dleted...
press and hold all together on :
1.)call key(green key)
2.)asterisk...and
3.) number 3 button...then(still pressing)
...turn on the unit by light press on power button.
ur unit should shortly display nokia then will change to "formatting"...
just wait for it to finish formatting then ur unit should start-up again and u can use it like brand new again.