unlock nokia 6200

Can somebody please inform me the code to unlock the Nokia 6200 for the message "Enter restriction code:" to allow me use others company's SIM Card? Thanks in advance for your assistance

IMEI: 351461500717045
Provider: AT&T Wireless

Also please help me on how I do so, should I remove the SIM Card or using another SIM Card (different Provider) typing the correct code when asked for the "Enter restriction code:"?

your code is
#pw+292315626075116+1#
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thk you