Instructions
Power on without SIM
Type in #7465625*638*Unlock code# (8 digit unlock code*)
Device should say: "Network Lock Deactivated"
Phone may automatically reboot
Read more: "How to Unlock Samsung SGH-A257 Magnet | Mobileslate" - http://www.mobileslate.com/blog/2009/04/09/how-to-unlock-samsung-sgh-a257-magnet/#ixzz0GlRIKq7a&A
How to Unlock Samsung SGH-A257 Magnet | Mobileslate