I doubt anything by Microsoft isn't sending your data somewhere. A better alternative is Fossify Messages. It is open-source and private (though it might not have some of the more fancy features).
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I also like QUIK from F-Droid
This looks good! Installed and test driving it now!
@nickb333 have you tried fossify messages? Also you can also switch to xmpp you family chats and voip calls
Edit : https://play.google.com/store/apps/details?id=org.fossify.messages
@[email protected] Google messages is E2EE and uses the Signal protocol for encryption. SMS is not secure in any form.
@[email protected] Good info, thanks. Your post prompted me to go away and research the E2E and I've ended up switching back for now. The other catch is that my phone network charges for MMS messages.