Do not count on getting cell phone reception in wilderness areas. Cell towers can be found near visitor centers at a handful of national parks, but in the back country, cell reception is rare.
Other communication options include satellite phones (pricey, but your best bet if on-demand access to civilization is a must), satellite messengers (capable of transmitting 1-way or even 2-way text messages), 2-way radios (best for groups spread out over a large area; average range is 2 miles) and personal locator beacons (for sending a distress signal).
Portable power sources (such as solar chargers) can generate enough energy to fully charge a smartphone.
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