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You Don’t Need to Use Airplane Mode on Airplanes
(gizmodo.com)
This is a most excellent place for technology news and articles.
Yes but the cellular toggle is for mobile data only. Turning it off won’t stop your phone from trying to connect to a network when there isn’t any (which drains the battery unnecessarily). Airplane mode turns off the antenna completely. The person I was replying to appears to say there is a button to do the latter without using airplane mode.