I guess it is something people outsides of American can't reason about. SMS here is like 10cent USD per message (Taiwan). No one is using it outsides of verific

I guess it is something people outsides of American can't reason about. SMS here is like 10cent USD per message (Taiwan). No one is using it outsides of verification codes now. People all use line, fb, wahtsapp or whatever network based IM. Because You can get a infinite data traffic plan with a decent price like 20USD/month. Besides that. You don't really want to give other your phone number unless you know them well. IM's identity is disposable unlike phone number.