What gives him away is that he assumes you know how to call him. Scammers don't do that and ask instead to send them your emails and password per Mail or text message. Totally not a scammer, busted at first glance.
This was the case in the German copy called schuelerVZ back in the days. You could deactivate it than you didn't see who was on yours and people still saw that someone was there
I totally go soon, just one more, ... ok this is the last, ... it didn't count, just this one, ... oh damn, I'm closed to 20 already, I didn't wanted to get there but now that I'm here, ... at 40 this happens again, right? Let's check, ...
Sigma meme