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Signal and Threema want nothing to do with WhatsApp
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Idk about other countries. But in India, SMS is pretty big for businesses to send updates to the customers. Like 2FA for bank transactions, delivery tracking, govt alerts etc. Customer to customer is almost nil except on rare occasions when maybe the internet is down and you need to send an urgent text.
And I should mention that domestic SMS is free (included with any active cellular plan)
Very good point. I did forget about that. That's pretty much the only time most of my family will look at actual SMS messages.