Timewasters know no geographical bounds. As somebody who has no intention of seeing anybody and would just rather waste our time, he can pluck numbers from anyone anywhere. That's why I like to keep these numbers in my phone under "wanker" or something as equally flattering. That way I don't waste my time answering the phone.
Text messages I don't respond to anyway, unless it's from a customer I've seen before. And as it says so directly underneath my number on my site, then I have no problem ignoring them, just as they ignore what I've written on my site.