Cellular and satellite phones

Hi,

I am currently working on a handheld device that
uses a OEM cellular/GPS combo-module with a SIM
card.

Here is our project website:

Here is the quad-band cellular/GPS module we are
using:
http://www.telit.co.it/modulef.asp?famId=13&famName=GM862-GPS%20Modem

There is also an FM radio IC on our device as well
as a bluetooth+802.11g combo module:
http://www.embeddedworks.net/newsite/WLAN/oem_sip_80211g.html

I would like to add also satellite phone capability
to this device. However except for the Thuraya
network, there don’t seem to be any voice+data
capable small OEM modules for the satellite
networks, so I am curious if anyone has been working
on a software satellite phone or if the protocol is
publicly available?

Soon I would like to integrate some or all of these
RF modules into a hybrid software radio, but for now
we are using the OEM modules.

cheers,
Jamie