I'm nearly always well within range of ambulances and hospitals with personnel able to call up my medical proxy.
Be realistic. If you're hit by bus on a city street, how long do you think your brain will spend being warm and dead before the information reaches someone who could call in the cryo team? And that even providing your brain stays intact.
how long do you think
My immediate family all know my wishes, I have a medic-alert type necklace with cryo contact info, there's similar info in my wallet, and so on. Basically, as soon as medical professionals learn who my corpse was, which should be close to as soon as they arrive, they'll know to contact someone who knows to tell them to put ice around my head (as a first stage in the cooling process).
By contrast, if I'm camping, then even if I stay within range of cell towers, and have arranged to call someone twice a day, then even just getting the ...
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