Can't make or receive calls and SMS's

I have a Blackberry Curve 8520 and out of nowhere it started refusing to send or receive SMS's and it doesn't want to make or receive calls, load airtime, check voicemail and all the telephony parts of it. However, my BBM and internet are working perfectly. I tried calling my service provider (MTN) about this and they said it was a call barring problem, they gave me a bunch of pins to use but my phone won't even allow for those to work. Please help, kind of desperate here. Thanks

In this situation you mobile operator is the only solution for you. You contact them again and ask how unbar your phone so that everything becomes normal.
tanzim
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