You think you guys have trouble when you're travelling, you should try living and working in the bush.
A few points:
You have to have a phone recommended for regional coverage
You HAVE to be with Telstra (no matter how much you may hate them) Even though all the other providers apparently use Telstra's network, NONE of them have comparable coverage in regional areas - many are not even close.
One other thing, I don't know about seriously remote areas, but I'm afraid the days of saying that CDMA coverage was not as good as analogue in 90% of regional Australia are gone. A case of things seeming better in the past than they actually were.
It IS CERTAINLY true though, to say that 3G/Next G does not have as good a coverage as CDMA (yet? please let me live in hope that it will still improve yet)
Steve