I think it depends a lot on the country you are in. In many European countries, the SMS is practically dead: in Germany or Switzerland it's all WhatsApp these days, with a bit of Telegram or Signal mixed in. Given this, I was surprised to discover how many people are still sending SMS here in Canada.

I think it has a lot do with mobile carrier pricing: here in Canada, mobile fees are enormously expensive, but SMS are almost always included for free. In Germany/Switzerland, many people use prepaid cards where SMS are (still) charged per message.