Unable to make calls or send sms messages via blackberry curve cell phone?

There are many possibilities,that can cause this problem.
A network issue or setting issue .In some cases mobile reset helps,in some cases the setting has to be set to factory default settings.

In some cases its SIM issue.
Also sometimes,some functions are blocked and that needs to be enabled.

If you need our Techno experts get more details for your problems solution.

Provide your mobiles exact model number,the Data of purchase and its serial number.
Also provide your current EMAIL id here.So when the details are ready for you.The Solution can be updated to you via your email.

This will help.
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Thanks.