hi, and welcome.
you didn't mention how long the travel will be.
if it's a short trip, you might consider renting a satellite phone. not that expensive to rent - but you do pay $1.75/min for outgoing calls. free incoming.
these folks have info here:
http://www.bestglide.com/iridium_satellite_phone_info.htmand there are other rental providers.
good luck.
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“Everyone should have a horse. It is a great way to store meat without refrigeration. Just don’t ever get on one.”
- ponder's dad