My BlackBerry Curve 8520 not connecting to the network

My BlackBerry Curve 8520 is not connecting to the network for three days now and I can not figure out what might be the problem. It is recognizing the mobile network, but informing that I am not in a covered area. I have removed the SIM card and inserted it in another phone, the connection was just fine.
What could be the problem?
Thanks beforehand for your assistance.
PS: for sake of good order, the mobile network service provide I usually use is Vodacom Congo

if i sent a sms my bkackberry curve 8520 tell me network out of order

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