Logistics for Antarctica are on full spin-cycle, and we are finalizing equipment lists and starting to test the equipment in the field before departure. Unfortunately, the details of conducting the trip often make it difficult to update the thread in real time, but I have copious notes, so look for more details as we get closer to leaving for Africa.
One of the interesting products we have elected to bring along is a new TextAnywhere unit, which uses the Iridium satellite constellation to send and receive 160 character-length messages. Outgoing messages can also include a geo tag for location. The unit creates a little wifi hotspot that you can connect to with just about any device, including an iPhone, laptop, iPad, etc.
I think this will be a pretty promising option for global travel, as communications are two-way, permitting incoming 160 character messages too.
http://textanywhere.ca/
Note: We have been paid nothing to use this unit. I just think it is worth mentioning. We will give a complete review at the end of the trip.