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I went to elementary school with the founder of RapidSOS and it's pretty cool to see one of us country boys making the front page of HN! If I'm being objective about this, I think it's a fairly good idea in the abstract but it will be very difficult to monetize. Where I grew up, there are still huge gaps in cellular coverage and this won't help people who can't even make a call. I do think there is a there there but it's fraught with peril. That said, best of luck to Michael! At the very least, his heart is in the right place.