Ask PYS: Communications

How Do I Test My Satellite Phone?, on Aug 25, 2016 asked:

I have an Iridium Satellite phone that I don’t use very often. Is there a way to test it without incurring any charges? - Mike

Thank you for contacting us Mike.  And yes, Iridium, Inmarsat and Globalstar all have free test numbers that you can call to ensure that your phone is active and working and you don’t have to use your precious minutes.  - Jeff

Iridium Test number: +1-480-752-5105
 
Inmarsat Test number +870 77699 9999 
 
Globalstar Test Number #TEST