I have strong suspicion you are not talking about Google's android dialer but some chinese ad-infested knock-off. When I used to have crappy Xiaomi, I had ads everywhere - settings, basic 'android' apps, most probably dialer too, definitely SMS sending app and so on. Threw it away and never looked back.

There are premium androids who give users completely different experience, be it Samsung, Sony, Google etc etc etc. Literally hundreds of models to pick your match. On my S22 ultra I never saw a single similar ad since I bought it. I wish people stopped bashing android just because they cheaped out and then found out that cheap phones are actually cheap to get revenue back in baked-in ads (there are other concerns coming from Google as creator but that's a different topic, since there is no saints among phone manufacturers and lure of ads revenue is too strong even for Apple)