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Privacy is Priceless, but Signal is Expensive
(signal.org)
This is a most excellent place for technology news and articles.
i live in Ukraine and I don't know anyone who uses sms.
also Whatsapp is not prevalent here either, basically everyone is using Telegram (or in case of older population, viber, which is installed on like 90% of devices)
are there any countries in which sms is still used?
Yes, North America between Android and iPhone.
I use RCS with everyone except iPhone users, which defaults to SMS.