To call an Inmarsat satellite phone, you will need to follow these steps: Dial the Inmarsat access code for the country you are in. You can find a list of Inmarsat access codes on the Inmarsat website. Dial the Inmarsat country code, which is 870. Dial the phone number of the Inmarsat satellite phone you want to call, which is a 12-digit number that starts with the digits 870. For example, if you were in the United States and wanted to call an Inmarsat satellite phone with the number 870776123456, you would dial: 011 (the U.S. exit code) + the Inmarsat access code for the U.S. (001) + 870776123456 So the complete number you would dial is: 011-001-870776123456 Note: Calling an Inmarsat satellite phone can be expensive, so make sure to check with your phone carrier for international calling rates and any additional fees that may apply.