Originally Posted by cblaisd

Don't know if this will fit the bill, but ScottC put me onto it and I used it for "insurance" while traveling through some spotty parts of the U.S. so as to have a second and third carrier in addition to my regular one.

I'm pretty amazed at the features it has for the price, and it works wonderfully:

http://www.amazon.com/gp/product/B00FX3YRNU