Hi! I have a problem with my pearl! When I'm trying to make a call it's saying that "Call Failed" I have to torn off my phone and than make a calll??

That means that you are in an area with a weak signal and your phone is dropping the connection. When you turn the phone off and then on, it actively searches for a signal until it finds one.

If you are in a weak area of reception or no reception you can get call failed. You can also get it if the network is congested (although sometimes you'll get a message that says "congestion" too, just depends.