If you're on an iPhone, uBlock is now supported: https://apps.apple.com/us/app/ublock-origin-lite/id674534269...
There's also Orion browser, but I found it to be a bit more glitchy, especially around sites like YouTube (fuck the app, I'm not watching videos there): https://orionbrowser.com/
I could also use a VPN to keep my phone always on my home network and thus behind my own ad blocking DNS but Mullvad's adblocking DNS was really nice and convenient.
For example, DNS blocking isn't going to block YouTube ads if you're using the app since they don't need to respect your DNS, but it will if you're in browser because they can't control that.
For apps I always use revanced.
I'm on your side but telling people to buy a new phone doesn't solve their problem. Short of that uBlock and/or Orion are their best options
Look, I still run AdGuard on my router, but it's not the same thing