What's wrong with my blackberry?

Two days ago, I tried calling my mom and it said "You are not authorized to make calls at this time". It didn't let me make or receive calls, or text. I called Metro PCS and they said that my phone connection was fine, that something was wrong with my phone. I can still get on Twitter and BBM and... show more Two days ago, I tried calling my mom and it said "You are not authorized to make calls at this time". It didn't let me make or receive calls, or text. I called Metro PCS and they said that my phone connection was fine, that something was wrong with my phone. I can still get on Twitter and BBM and stuff, so I don't understand why I can't text or make calls. Also, there's a white triangle on the top of the screen. What do I do?!? I REALLY don't want to reset my phone.
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