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Just like communicating on the radio, you do it when you are free to do so safely.
However, unlike that bottle of water you are drinking that may make you have to pee, a timely text message to ask your buddy where the best place to taxi is for restroom access before you land is very helpful! Especially if you need to land at IWA and are unfamiliar with the grounds ;).
You eat because you have a moment, and you are hungry. You text because you have a moment and you need a ride from the airport.
Otherwise, all I can say is wow, just wow. How did I ever make it through life without texting someone a messsage about where I can pee. Nothing like having an alpha/numeric keypad to replace basic social skills.