For ads, I don't. For customer support however, a verified phone number (that I can look up myself, easily, perhaps as part of a FCC website function, for example) would be a huge win though.

I used the Apple Business Chat feature for support for a shipping issue I had recently with Everlane and it was actually amazing. It had its own verified icon, so I knew it wasn't a scam, I could answer when I was able, and they were able to respond as they were able (though, I did find it quite timely, even when I wasn't) and not at all did I have to call someone, or talk talk to a chatbot (as far as I could tell anyway). It was a seamless experience and it got my issue resolved.

I personally like this model of customer support. No reason this can't extend to SMS