1. RJL24's Avatar
    TMobile customer. BB8900. About 9 months old.

    Received unlock codes via email from Tmobile but could not get them to enter.

    However noticed when I put in an ATT sim card the phone allowed its usage.

    Does this mean the phone is unlocked?

    Posted from my CrackBerry at wapforums.crackberry.com
    02-14-10 08:52 PM
  2. Laura Knotek's Avatar
    Go to Options>Advanced Options>SIM card and type mepd (you will not see what you are typing). If it says SIM disabled and network disabled, it is unlocked.
    02-14-10 08:57 PM
  3. dictoresno's Avatar
    the other way, as you mentioned, is when you put another carriers SIM card in and it allows phone calls over their network, the phone is unlocked.
    02-16-10 02:44 AM