Those are good points for enhancing individual security. However, I would add the fact a surprising number of apps have the capability to turn on the WiFi port(s) on their own, under certain conditions. If you have the WiFi turned off and happen to have one of these apps, they can override your choice and reopen the connection; for example, say you have an app from some big box store or other and you walk into the store with WiFi off; the store's system will detect your presence and reestablish contact. If you really want to be certain about your security, you should re-check the WiFi status from time to time...
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