Even at night when you don't use your phone, you are tracked and served ads. I use blokada and it blocks over 5000 ads and trackers in three days, 12 hours of effective usage, meaning 400+ ads/h: https://raymii.org/s/blog/My_phone_serves_me_400_ads_per_hou...
Blokada is easier to use that dns66, just one big button and you're done. It doesn't require root, but just like this app uses a local vpn (on the device itself, no servers involved).
For me it even blocks ads inside the YouTube app, which Adguard on iOS couldn't do...
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