Interesting since you can't use basic feature of your phone. Have you checked Phone/Call setting to make sure there's no activated Call Blocking or Fixed Dialing Numbers features? You have to turn it off all. You need in good coverage network area also to see full signal bar, blackberry dots logo and 3G or Edge or GPRS indicator. If you didn't see those, you might need to register your device to your network carrier. Article ID: KB00510. How to register BlackBerry smartphone with the wireless network.
If the problem still exist, you need to call your carrier to find out what is going on with their network service.
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