No calls? No text? No good Slaytonk! Let's get yu working again. Is the data connection through WiFi? Are you getting any type of error message? Is this just happening in one location? Is the data connection through WiFi? If the phone's Wireless Mode is turned off, that would cause the phone to be able to still connect to WiFi for data but not make calls or text. Try turning wireless off and then on if it's already on http://bit.ly/QmcLPt.
Blackberry phones also benefit from the occasional reboot http://bit.ly/QulU6i to refresh the settings and connection to the network.