Help On Nokia 6101

my mum's nokia 6101 is demanding for a security code.the problem is that she has forgotten her personally security code and we have used some of da security codes available to nokia phones but to no avail.
please,i don't know if any of you has any idea,to please help me.thanks

Check the IMEI. No . .by typing  *#06#  & p0st it here. . So I'D help u generate the master security c0de. . . It unlocks in m0st cases