To expand on Firefox mobile: if you haven’t tried it, give it a shot. uBlock Origin works just like on desktop. I have seen maybe five ads on my phone browser (including Youtube!) since buying it in 2019.
But many browsers on iOS support ad blockers. Most like Brave and Vivaldi have it built in. Others like Orion and Edge have added support for extensions. Firefox is one of the only that does not have any support for an ad blocker.
My only complaint about Firefox on Android is it's slow even with ad blocking. Chrome is noticeably faster. Brave gives you the best of both worlds: speed and ad blocking.
The only issue is that Firefox on mobile is visibly breaking a couple of sites every now and then; if you can put up with that for no ads (I can), then its great.