Here's what Iridium says about the GO!®:
"Iridium GO!® provides global voice calling and text messaging solutions for your smartphone, as well as enhanced data capabilities offered through optimized apps to meet your unique needs.
No worries. No roaming charges. Just connected and in touch wherever you are, whenever you need, with the devices you rely on everyday.
With one of the smallest form-factors in the industry, you can comfortably take Iridium GO!® anywhere you travel. Featuring a compact, portable design, the device is easy to carry, stow away in your backpack or mount for mobile applications. Iridium GO!® is ruggedly engineered to support you with:
Military-grade (MIL-STD 810F) durability
Ingress Protection (IP) rating of IP65
Dust proof, shock resistant and jet-water resistant
Stable, lay-flat design
Compatible with Apple® and Android™, Iridium GO!® extends the use of your trusted smartphone and devices no matter where you are with:
Apps optimized for voice calling, SMS, email, weather monitoring, and more
A 100 foot radius Wi-Fi connection for up to five mobile devices"