Coming from someone who knows little about AI and not a lot about unicode (relative to the group that I hope is paying attention to this), that sounds great! 
I would think so. Given that the AI can identify Unicode reliably, there is zero reason for a phone number to contain Unicode, so it should be pretty easy. Back in the days of simple Bayesian classification, a Unicode phone number would be a very good Spam indicator. A bunch of them also had some weird unicode TM symbol and a couple others.
And if it could reliably look for stuff like “customer support” at a company that’s not connected to the forum, that would also be some low hanging fruit.