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).
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).