How can I display my SIM card phone number on my Iridium phone?

Step 1 - Press Menu until you see "Phone Book", and then press "OK" to select.

Step 2 - Press Menu untill you see "My Phone Number(s)", and then press "OK" to select.

Step 3 - Your SIM card phone number will be displayed.

Step 4 - Press and hold "C" to exit the menu.