The hardware in the iPhone and features are literally just Globalstar's SPOT tracker with an Apple UI. The Spots start at like $150 and have monthly service starting at $17/month, much more attainable than a satellite phone and are relatively common with a more casual market of hikers, backpackers, etc. It's only good for calling emergency services and sending "I'm OK" and location check-in messages to loved ones, the InReach and similar products that attach to phones to give them satellite capabilities are a better comparison to emergency SOS via satellite, than a full-on satellite phone with full voice calls is.