SMS isn't a great option if you're communicating with people in multiple countries, and often not if you're traveling internationally yourself. Signal might be, if only we could get everybody to use it.
They won't. Been there. I asked a lot of people to contact me on phone, sms, email, etc. but not on facebook. Most of them I haven't spoken for years now, ever since I silently deactivated FB. Turns out they were/are not actually interested in me.
