Is internet connection required to use phone as presence sensor?

You have to have data activated on the phone in order for it to be used as a presence device using the official smartthings features . This has come up in the past with some community members whose kids have smart phones but without data plans.

There are some community members who have created their own presence recognition programs based on what is connected to their Wi-Fi, but that requires some significant technical skill to implement. So it’s doable if you want to roll your own, but not really easy.

Some further discussion here

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