11-28-2012 05:44 PM
Hi and Welcome to the Community!
Anytime random strange behavior or sluggishness creeps in, the first thing to do is a battery pop reboot. With power ON, remove the back cover and pull out the battery. Wait about a minute then replace the battery and cover. Power up and wait patiently through the long reboot -- ~5 minutes. See if things have returned to good operation. Like all computing devices, BB's suffer from memory leaks and such...with a hard reboot being the best cure.
If that does not help, then what are your signal indicators at the top of your BB? Does it recognize your carrier? Is your Mobile Network radio on? Otherwise, you should ring up your mobile service provider for formal support...calling is a basic function, so it should work.