Cannot register with the Iridium network.

• Is a SIM card inserted into the phone?
• Check to see that the antenna is fully attached, fully extended and vertical, and that the phone is outside with a clear line-of-site to the sky.
• Turn the phone off and then on again and wait for the phone to register.
• If the phone will not register, attempt to force registration by pressing the up arrow key and the number 8 on the phone's keypad.