with older nokia phones from sun cell (not applicable to new phones)
you can download a calculator...its free. you just need to know the code.
yes you need to enter 10digits to the phone to unlock (openline) it.
the 5 digits i gave is to input to the calculator together with the 15digit serial to produce the 10digit code to unlock the unit from sun.
btw, some calculators dont work.
there is no define list of phone which calculators really work with what.
entering wrong code can permanently lock the phone meaning even if you get the right code later on, unlocking it with the code will be invalid.
if this is still too confusing or too technical for you, save yourself the trouble.
drop by gizmo.