Unlock Nokia 6200

I have a Nokia 6200 locked to AT&T ni the US and would like to switch my service to T-Mobile - but not have to buy a new phone.

EMIE 351509000362090

Thanks

 

#pw+975 252 100 364 356+1#
#pw+416 817 040 440 115+7#


ENTER CODE WITH OUT SPACES
Remove sim first, press #
Press * 3 times fast for (p)
Press * 4 times fast for (w)
Press * 2 times fast for (+)
Verify code before pressing the last #.

YOU ONLY GET 3 TO 5 CHANCES TO ENTER THE CORRECT CODE

"Phone restrictions off", it's unlocked.
"Error code" wrong code. STOP tell me.
"Not allowed" or "Can Not Undo Restriction"
it is hard locked.
Used up all your free tries!!

 

do I try the first code above starting with 975 first (obviously entering it very carefully)? Or will either code work?

 

#pw+416817040440115+7#

 

one last question, before I do this... do I enter the code when the SIM card removed for the Nokia 6200 model? or do I need to do it with the Cingular SIM card in it? or do I need to wait till I sign up with T-mobile and use that card?

thanks again