My wife was on a first aid course a while back and she related during the course about her being 2nd car on the scene to a bad car crash and how it was unfortunate being on a bit of road known for being a blank spot for cell phone coverage.
The guy running the course said it's always worth trying because an emergency call will put both your phone and any cell tower it can reach on maximum transmit power.
Obviously not really relevant in the bush but useful info for anyone who didn't already know this. (I'm assuming it's a fact of course)
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