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    ATT&T pay as you go SIM in unlocked T-Mobile blackberry?

    I just unlocked my T-Mobile Blackberry Curve 8520. And I purchased a AT&T Go Phone Sim Card. It's showing in the advanced options>sim card my AT&T # and also when I go to make a call it shows AT&T However, it always just says "call failed" What am I missing? Does that mean it won't work?
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