Kinda pricey for the standalone, but not too bad. $300 for a starter Garmin. But you'll have about a $160 per year subscription. (I've had one for years--it's been invaluable peace of mind on solo trips.)

The Garmin uses Iridium; the iPhone is apparently Globalstar. So don't try using the iPhone at the poles. ;)

Great to see it coming to phones. Maybe Pixel will get on board.