You'd think that services should be aware of the security concerns in this inbound vs outbound distinction, but I've had cards where after calling the number on

You'd think that services should be aware of the security concerns in this inbound vs outbound distinction, but I've had cards where after calling the number on the card, customer service person actually instructed me to hang up and await a callback from them... Which almost always came from some other line with some other number... OTOH in hindsight it could be because they don't trust caller id on their side and want to verify that the call is really made from/to a phone number that's on file.