Phone Presence requires Cellular? Even with WiFi connected?

Unfortunately, life 360 also changed their methodology so that now you also have to have a data plan for their app. It was at the same time that they stopped supporting tablets and windows phones, which don’t use the same kind of location services.

Can any phone, anywhere, work with Places?
For Place Alerts to work, the phone you are locating will need to be either an iPhone or Android device and have the Life360 app installed, with an internet connection, data plan, and location sharing turned on.
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While some users were previously able to use tablets, Windows phones, and non-smartphones with our app, the latest version and technology is no longer compatible with these devices.

Some community members have set up virtual presence sensors which work when they connect to specific Wi-Fi networks, but you have to have admin privileges to the WiFi network to set it up, and it will depend on what kind of router you have whether you can do this or not.