n70 sp data corrupted
 

is there any chance of makinf this nokia n70 sp data corrupted.
because this n70 is before working with all types of sim cards.
and suddenly when i flash the phone and put my sim card it tells
sim card not valid.i did not make openline so it does not been corrupted
by dejan's unlocker.it just went like that
can some body tell me the solution to this.
the serial no. is still complete
thanx in advance