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by tjohns 3776 days ago
There are two-way radios that support text. Since a lot of newer radios are using digital signalling, it's not hard to add in.

Off the top of my head, any of these would work: Amateur radios that have D-STAR (connected to an Android phone), Garmin Rino, Motorola DTR, and TriSquare (discontinued, but you can find them on eBay).