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How to connect your iPhone to a satellite to send messages
If you've unexpectedly lost service, this iPhone feature lets you stay in touch with friends and family.
If you just want to temporarily restore messaging capability, which includes texts, emojis, and Tapbacks, by connecting to a satellite, here's a step-by-step process: On the iPhone 14 Pro or later models, a top-of-the-screen feature called Dynamic Island shows indicator dots demonstrating your connection's strength. Your emergency contact or family member must return to the text conversation and tap "send via satellite" underneath their message bubble.
Or read this on Mashable