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I have in 10 years of being on Signal never managed to get a single person to be upgraded from SMS to a proper Signal contact.
Plenty of WhatsApp contacts.
I was using Signal to replace the default SMS app on my phone specifically because it was Free Software and I trusted it more as the SMS app. It had nothing to do with privacy, you don’t get that on SMS, but to do with trusting the code.
Alas I’m now using the built in app and have uninstalled Signal.
I was only able to get my Android friends to convert. Now they aren’t using it either. Truly a shame.