Would be interesting to know how much data leaks on a new iPhone with some of the iOS privacy settings enabled and a handful of popular apps installed (WhatsApp

Would be interesting to know how much data leaks on a new iPhone with some of the iOS privacy settings enabled and a handful of popular apps installed (WhatsApp, Instagram, Google Maps, Uber, etc). And then if you use a commercial VPN with DNS ad-blocking enabled, how much more does this help?