Can I use a Blackberry from Cingular with my T-Mobile SIM Card?

I

itsxcomplicated

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My mom uses her T-Mobile SIM card with an AT&T phone (same as Cingular), but when I put my SIM into the Blackberry, it says "Invalid SIM Card". Help please ? =(
 
If the Blackberry Phone says Invalid Sim means it locked to network...You have to unlock it use with other GSM Network Sim card...You can unlock it easily using the unlock code from the site Superunlockcodes.com then use any GSM Sim card.
 
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