07-21-2011 06:56 PM
Post relates to: Treo 750 (AT&T)
07-21-2011 08:05 PM
You will have to contact AT&T and ask for an unlock code.
WyreNut
08-03-2011 12:36 AM
Have you enabled the Pin Lock? Actually Pin locking the sim card would be to prevent someone from accessing your contacts and account info if it was ever stolen. Plus, it cannot be used in the phone either.