Ah, so your phone is the trust point. That's better than it could have been, but it still leaves other issues, like sites with multiple domains or data brokers cross-identifying you based on phone and user information, e.g. 'this phone verified someone on porn site A. This same phone over on social media site B also verified, and on the social media site they have all their real-world info, so now we know their interests', etc.

And before anyone asserts that the phone can be anonymous, that doesn't work, otherwise you can just have an app that claims to have a verified ID attached.