Phone is registered, but cannot make a dial-up data connection.

• Verify that the phone is displaying good signal strength.
• The SIM card must be provisioned for data. If in doubt, contact your Service Provider.
• Check the software version in the phone by pressing *#91# on the keypad. The Motorola 9500 must show software version INC0620 or later. The Motorola 9505 must show software version LAC109G. The Motorola 9520 must show software version RAC0620 or later. (Newer data-capable versions may be released from time to time, and will be indicated by a higher numerical sequence.)
• Check the cable connections.
• Check to see that the dialed phone number is accurate, and that it was dialed in international format (00 + Country Code + Area Code/Phone Number).
  
  For example, if you are dialing an ISP in Tempe, Arizona, USA, you would enter
  00 1 480 555 5555, where 1 is the country code and 480.555.5555 is the ISP's telephone number. You can verify that you are dialing the correct number by dialing the number as a voice call from your Iridium phone. You should hear your ISP's modem tones if dialed properly.
Verify that your settings have not changed (modem properties, phone number, user name, password, etc.)
• Is your Iridium handset dialing? While dialing, the Iridium handset blinks "Data Call in Progress". If not, cycle the power on the phone to reset it.