Globalstar sat phone sms

Hi all
I've just ordered a new Satellite Phone R290 through e-bay as the wife and I are off on an extended trip around Oz in about 6 weeks.The minister for finance totally disagreed with my impending purchase as she thinks I have too many gissmo's and stuff that she knows absolutely nothing about . Its quite surprising how you spend 12 months planning a big trip, getting everything that you think you need for an enjoyable, hopefully safe trip and she says how am I going to use my hair dryer away from civilisation. ( I"d like to see how she would fix a second flat when you only have one spare. ) I finally decided to go ahead and buy it for piece of mind.There is also the case of it being able to help out some other poor unfortunate if the case arises. My question is does the R290 send and recieve sms text on the GSM mode only or does it also work on the satellite system.

Thanks in advance

Smod