Getting stuck outdoors without a strong cell signal is not ideal. We have already covered plenty of iPhone compatible satellite communicators for these types of adventures. The Garmin inReach Messenger is also worth a look. It is a tiny little gadget that combines with your iPhone for global two-way messaging. Its app lets you share your adventures with multiple people at the same time. You can also use preset messages to update your contact.
Thanks to this device, you can trigger a SOS to the Garmin IERCC center when you are in trouble. The battery life lasts up to 28 days in 10-minute tracking mode. The Garmin Messenger app supports text messages via satellite or cellular networks.[where to get it] [app link]