Need Restriction code for Nokia 6230b

I have had a old 6230b that I used as a backup. When I recently tried to use it again it asked for a restriction code. Can anyone help me with that?

Network: Cingular/AT&T
State: Colorado
Model: 6230b
IMEI: 355032/00/057674/8

Thank you!!

 

#pw+739 560 053 767 475+1#

FOR THIS PARTICULAR MODEL, NON ACCEPTED SIM IS REQUIRED.
1. Insert a non accepted sim, most times it will show "Phone Restricted"
2. Press the UNDO option
3. You should see a box that says enter restriction code.
4. Enter the code given and then press (OK)