Hi,
I've no experience in Australia but Britain has a fairly developed 3G network. There are places, even less than a mile from the coast, where there is no reception. The last thing I'd do is trust it far enough to rely on it for communications at the moment when the crap hits the fan. I'd be very surprised if you could maintain contact right the way across the strait, I don't think you could do that even with VHF. The Bass strait's reputation precedes it, if you want comms for safety, SSB or an Iridium phone seem to be the way to go.
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The message is the journey, we are sure the answer lies in the destination. But in reality, there is no station, no place to arrive at once and for all. The joy of life is the trip, and the station is a dream that constantly out distances us”. Robert Hastings, The Station
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