There’s a market in Israel for “Kosher” cell phones, which purposefully lack features like text messaging, etc., among the haredi / ultra-Orthodox communities. (See, e.g., this for details)
However, the IDF and others are trying to ensure that these phones can receive emergency messages. They want to be sure that these messages, and only these messages get through.
(Oh, and it doesn’t mention whether or not these Kosher phones turn themselves off or refuse phone calls on the Sabbath. I’d be interested to know that.)