If its for emergencies, get an EPIRB.
They are more reliable and robust than phone, also give GPS position if you get the right one. Simple,to use and activate in a hurry.
If its a real emergency, stuffing around swapping SIM cards, adapters and phoning people is fraught with problems. The use of next G sim cards isnt Telstra approved (but it works on some models and not on others).
I broke the antenna on a 9505 in the past when trying to get signal and then had nothing. Two days onto the Simpson.
Now I carry both, but if pushed would be a EPIRB as primary.