Mullvad VPN works well on Android and has some DNS based ad blockers & content filters in the VPN app (though off by default iirc). Mullvad browser is not ported to Android.

That said, it's important to understand that VPNs don't provide privacy in any absolute sense. They can (maybe) obscure data about your browsing habits from your ISP. But they won't stop all the other, more effective tracking exists nearly everywhere else on the web.