The new firewall for the modern Internet
nextdns.io
Set it up, toss it into your DNS settings. Toss it on your router, too. Better than Adguard, DNS66, and Blokada because you can control your filters like uBlock Origin, but you don't need another app on your phone draining battery, and you can put it on any device.
Alternatively, uBlock Origin in Firefox Mobile or rooting your phone and using Adaway.
Free version gives you plenty of alottment to block on one or two devices, but if you want to slap it on multiple and your home network, it's worth the price.