Make sure you have pressed the SEND key after you have dialed the number. Check the battery and make sure it is properly placed within the unit and that it is charged. Unable to Use Optional Feature Feature is not activated, contact Customer Service. Unable to Hear Volume is not turned up, adjust volume. Take a look at your antenna.
Loose wiring can cause problems as well.
Fast Busy Signal when Call is sent Call has not been completed. Number entered too quickly. In certain areas, new customers may be required to use a four-digit PIN to protect their phones. Your PIN Security Code is also required when you ROAM in many areas outside of your home calling area. If you hear a two-ring prompt or local prompt, you must use the PIN required dialing procedures.