Earlier quoted context omitted.
Are we ever going to see unity between these services, or are we doomed to have little walled-off fiefdoms forever? A phone number works anywhere in the world, to anywhere in the world, with anyone who has a phone. All e-mail providers work with each other. I don't care who you're with, and I wouldn't even have to know except it's usually part of the address. SMS works no matter which provider we both have. It feels…
FWIW, email only sorta interoperates...try running your own mail server and unless you get all the elements of server reputation exactly right, your email will probably not get delivered to people using the large email providers. Thanks to spammers, we've allowed our open, interoperable standard to be much more closed. And SMS is also frustratingly non-universal. After years of having cell service with one of the lar…
Google, Hotmail, etc, all work just fine. Just make sure to set up DMARC (DKIM+SPF) and TLS by default.