Cam beat me to it with the Globalstar availability.
This is another example of why not to buy Globalstar. My Globalstar gets horrible coverage even in Maryland, but my Iridium has a full signal always.
I can't help the OP with his issue, but this is a warning to others in the market for sat phone comms. Do your homework on the systems and expect to pay for good service. There is a reason why Globalstar service is cheap, because it is unavailable most of the time.
I am not affiliated with any satellite phone manufacturer or service provider other than being a customer and having experience with both Globalstar and Iridium.
Constellation Update and Advisory: News Center: Globalstar Corporate
Globalstar is only good for simplex data (Spot Personal Tracker), and that still has coverage limitations.