Dr. Bird wants to know if there's a hybrid digital/satellite phone that will use satellite when in remote areas, and regular cells when he's in town. The Marines use those. Leo says that there are three satellite companies including IRIDIUM, Inmarsat, and Globalstar. So you choose your network and then choose your phones. The Thuraya X5 is supposed to be the world's first hybrid phone that does both. It's Android. But they also make a device called a "Satellite Sleeve" that will turn any mobile phone into a sat phone. https://www.thuraya.com/satsleeve-plus. Available at the Satellite Phone Store.
Check out Dr. Bird's images here - https://www.flickr.com/photos/gary_s_meredith/