how do I unlock 3210?

Hello, my sister gave me a nokia 3210, which is locked, but she does
not remember the unlock code. Is there a cheap way to unlock it (maybe
open inside and short circuit something, or construct a simple
circuit) ? The local store asks for $24 to flash the darn thing... If
there is a cheaper solution, I won't mind trying it even if it is
risky, since the phone does not even worth $24 !!!