Great thread. I just bought a home at TV but I still work and run an IT organization. We contemplate our employee mobile device experience quite a bit. There are a few things that if done, really can help here. 1. email: if you have a "free" email account (i.e. Gmail), everything you do with that "free" service is tracked and that data is sold. Some on this thread are okay with that and some are not. If you don't like it, try a paid, secure email service like Protonmail. 2. browser: the browser (Safari, Chrome, etc.) you use gives the developer a wealth of knowledge about what you do at all times and they make money off that. Did your son search for "restaurants near me" using his phone's browser or something like that while he was down there? Is he logged into his phone's browser with the same "free" email account? There are a number of secure browser options he can download and use like Brave and Firefox Focus that are really good. 3. search engine: most browsers use Google as the default search engine so when you search for "restaurants near me" Google is performing the search (and making money off that search). Doing it on Chrome, logged in with your Gmail account pretty much allows them to track everything you do on the phone. Try changing the default browser to Duck Duck Go. I play around with GPS settings but haven't been able to optimize it as map apps need it and I depend on that app. I've settled in on leaving it on and only letting Google Maps keep my trips for the shortest time before deleting. Hope this helps.
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