unlocking samung v206 cellphone (T-Mobile)

Hey~ya'll
I need help on unlocking my samsung v206 cellphone.
I currently have AT&T and want to give this phone to my dad who uses T-Mobile. Can you guys tell me how I can unlock this phone?

Thank You

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start your adventure with *#9998*3323# and any invaliud sim if you are version 1.5 and earlier, then select mallov fail and after reboot *0141# and hit call. It will then ask for your password which must be 00000000 (change it back and try again if you have changed it). If this doesn't work try #0111*password# where I don't know the password value yet as 00000000 tends to be wrong for ver 1.6 and if all else fails Cerebros is available on my site.