Comment by averageRoyalty

> With WhatsApp, LINE, WeChat, Telegram etc. I think this is pretty much a solved problem in the rest of the world, really only the US is behind here.

I don't think this is accurate. In ANZ at least it's fairly uncommon, and I'd imagine there are a number of other similar countries. I would be surprised if the number isn't 100m+ first world users who don't fall into that bucket, not including the US.