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Gemini is about to slide into your DMs
(www.theverge.com)
This is a most excellent place for technology news and articles.
The shit I send via sms is like "Do you want pizza tonight" or "how far away are you". Anything more detailed gets turned into a phone call. It'd be cooler if it were Signal but alas, family habits die hard.
For sure, my family took to it because Hangouts was being deprecated and we wanted a new group chat system. Easier for them since they had already adapted to a more modern text system, but I used it as an opportunity to get them onto a more secure platform and they did!
Signal Matrix etc are the way. Good luck in the future.