It only works on your own wifi network. You will still need standalone adblocking add ons or apps for when you go on the internet away from home.
If you surf the web with safari, I use 1blocker and it works quite well. If you need ads blocked in other apps, I have used and am pleased with weblock, which blocks ads in all apps on the device (it uses Proxy Auto Configuration, which appears to be a newfangled and IOS permitted way of blacklisting sites in your .hosts file).
eta: weblock has an android version. I suspect 1blocker does as well at this point.
