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

M

Meagan S

New member
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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