http://blog.delorme.com/2011/06/03/delorme-inreach-two-way-satellite-communication/

We’ll be bringing this unique two-way satellite GPS communicator to market later
this year.

The DeLorme inReach continues our effort to keep people connected when they
travel outside of cell phone range. With the inReach, you can send AND RECEIVE
text messages with true pole-to-pole global coverage. The inReach can be used by
itself, with the DeLorme Earthmate PN-60w GPS, or with smart phones running the
Android OS!

Pairing the DeLorme inReach with either a PN-60w or an Android device allows you
to type up to 160 characters and send your message to friends and family using
either e-mail or SMS text message addresses.

http://shop.delorme.com/OA_HTML/DELibeCCtpSctDspRte.jsp?section=10460&minisite=10020

Thanks to Gary.

I'd say way way too expensive and bulky.