yeah, in southeastern europe it was viber, i think northeastern europe it was telegram, it's whatsapp here in portugal, my landlords and ladies all have asked to use it, even though we all have $10/month SMS prepaid accounts with vodafone and whatnot
signal was actually the first, they merged out of redphone and some other thing i forget, some SMS type deal, they actually were the ones who pionered using SMS as auth right in the beginning, circa 2013, i had redphone on my sony xperia android back then
so, yeah, you obviously were not there when it was all starting, circa 2012-2013, it was definitely signal first, and everyone else was riding on top of that, and it was open source originally, that's part of how it happened
signal -> whatsapp -> telegram is the sequence i recall
i was in balkan so maybe it looked a little different, they had viber, which also was big i think in west asia, ie india, pakistan, georgia, etc
I think I was playing around it as well around that time. Even did couple of calls over their encrypted connection. Felt pretty 7331 haxx0r at the time. But it was lagging as hell. Probably would've gotten use to it if someone else would've used it also. But they were pretty unknown. I heard about them because we had some innovation hackathon at the place I worked then. One proposed project for the hackathon was encrypted chat app, and after searching, found the redphone. Another project was planning poker for software development teams.
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nono, whatsapp was far earlier, remember people buying esplicitely android phones and not nokia symbian to have whatsapp working better
they weren't using e2ee until after textsecure and redphone invented it, idk what to say
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