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Verizon and T-Mobile both have satellite comms built in on the newer iPhones as the previous reply stated. I have used Verizon’s service as early as 3 days ago out in the chandelier sound and it does work. FYI- you must have a clear view of the sky, orient the device toward the relevant satellite as your phone guides you, and maintain that position while sending and receiving texts. This will not be a solution if you are in real deep doodoo, i.e. total loss of power onboard and on devices, capsized and or lost phone in the water, etc.
