need help with Blackberry Curve on T-mobile?

Mini Model

New member
OK so, I'm trying to top up but every time i dial the top up number it says i have insufficient funds (obviously, that's why I'm trying to top up!) but it's supposed to be free to top up isn't it?! I don't know if I'm dialling the wrong number or what so can someone either tell me the number, or tell me how to top up correctly?!

I'm using a voucher (obviously)

Thanks
 
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