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Iridium is full duplex.
Iridium has some problems though. People still don't know if Iridium will ever turn a profit. Sounds like the perfect business for an ISP to get into, we already know what it's like to never turn a profit, and by having to launch ten times the birds Internet in the Sky may never fly. The first bird to re-enter and kill a 747 will cost ya big time as well, when you increase the number of birds you increase the odds of hitting something when it falls back to Earth.