Phone numbers get complicated, yeah, but US numbers are pretty trivial (and so are they in several other places, and even for UK it's just more annoying, not re

Phone numbers get complicated, yeah, but US numbers are pretty trivial (and so are they in several other places, and even for UK it's just more annoying, not really computationally harder). So at _best_ the security analysis is: "okay, all US phone numbers and a bunch from other places might as well be in cleartext", which is already broken enough that it's basically useless.