Blackberry 8700g INVALID SIM CARD?? HELP PLEASE

I just received my 8700g.  It has the T-Mobile logo on front of the phone, BUT the phone was used by a Cingular subscriber  when I turn it on.  I inserted my T-Mobile SIM card from my T-Mobile Dash phone and I get "Invalid SIM card message"??  Called T-Mobile and tried to trouble shoot myself with no luck.  Any helpful input?? Much Thanks...

The device is locked, or you unlock the device or you need to change to Tmobile
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