Unfortunately in the US, maybe elsewhere, pharmacies and medical offices have trained the elderly it’s okay to verify their dob when they call. Costco does that when they call and it drives me nuts.

A few UK banks detect that you're on a phone call and show a message like "we've never called you" or "we are not calling you right now" in their app, I think that's really smart.

Here is a fun one, my mobile phone company has an account lock along with a pin and OTP over SMS system. In order for me to activate a new device (like an phone upgrade) with eSIM over the phone, I need to unlock my account with account lock, give them the pin over the phone, and read the SMS OTP to the mobile phone rep online. I get doing the account unlock and verbal pin, but I don't get why they ask for the OTP especially when they train us to never share the OTP over the phone. I even asked the rep about it, but he mentioned that you should never share the OTP if you did not initiate the service request. From a security posture point of view I think that stinks. I am not exactly sure how they expect SMS OTP to work in the case where my phone is not functional.

And then we have the national post office sending its notifications from the scammiest-looking domain they could find: noreply@notif-colissimo-laposte.info

In Turkey, if my bank calls me, they also send a push notification telling "We are calling you. The representative's name is $NAME. You can talk safely".