I got this too, and it wasn't any kind of nefarious-sounding link, either, so for anyone reading this: it can happen on stuff that looks innocent!
When the phone # message popped up, I quickly did force-quit Safari. I did not call the number. Restarted (all seemed well, no message, not frozen, etc.) THEN read to restart w/ shift key, so quit again and restarted w/ shift key.
So my question is this:
Is my computer ok? I checked in sys prefs, and my firewall is ON. I don't know what else to look for. I have bills to pay, but now am worried about whether there is malware already on the computer. How do I check this?
Thanks so much, hoping someone can clarify.
Judy