[benologist]

Conferences, where most people are strangers and there to swap contact info. And of course bars and clubs and conference parties... an attractive woman or man wants to give your drunken self their contact info! Woot!

And that's not even what I was really thinking of... in poor countries the last thing you want to do is pull out a smartphone, let alone pass it to the doctor, tour guide, taxi driver or whoever you think is standing in front of you.

[coderdude]

If you don't even want to pull the phone out to begin with then you're most likely not hitting them up for their phone number unless they happen to have a card or you happen to have a pen and sticky notes.

It's possible that the people who are already too cautious to even reveal that they have a phone are the same people that would never make use of a service like this.