Can someone help me in unlocking my Nokia 6200?

IMEI# 351461501278427
AT&T - USA


I tried a Unlock code from the forum -
#pw+794571223257275+1#

first time i missed the letter - w and +
and typed -> #p*794571223257275+1#

and the second time it gave me a code error.

Was the first try a valid code ? and Can I try to enter in a unlock code again?

Any help is appreciated.

Thanks in Advance,
Praanav