My flip phone is a completely ad-free experience. I would recommend it for just that reason (among many, many other benefits).

With no channel for ads in your life, when you step into public spaces, you realize how much of our linguistic and visual spectrums are polluted by ads. The ad is always the same message too: "Buy this!" it screams as loud as it can, often trying to do so over the noise floor of other ads.

Remove ads from your life and behold the vistas of thought that open up, those previously drowned out by mindless noise.