DWK-
Funny you ask.
This year, for our annual Baja fishing trip (Sea of Cortez), our group are all renting
Iridium satellite phones from
PHI Leasing.
The rental cost is $55/week (cheaper for longer rentals), plus a fixed $39 round-trip shipping via FedEx (regardless of how many units).
Call costs are: $1.50/min. to anywhere world-wide, $0.99/min. to other Iridium phones, and $0 for incoming calls (but those same calls cost the caller $3-8/min.)
We figured the Iridium were perfect for us to make calls to one another out on the open water, call home, or make SOS/Emergency calls (heaven forbid). We don't expect any non-Iridium-originated incoming calls.
Now, if you travel and need cost-effective incoming call capability, then the Globalstar is your choice. While the outgoing, and peer-to-peer calls are a bit more expensive, the incoming calls are bit more reasonable to the caller (equal to just normal long distance to a Texas a/c).
BTW, I have no connection or interest in PHI Leasing other than being a satisfied customer.
HTH