[Markoff]

I think SMS fallback is the only killer feature missing in Whatsapp. I'd be glad to ditch my dedicated SMS app for something else (I have Whatsapp anyway already). I used Signal for few years as SMS replacement plus IM on top of it (though used IM only with family since nobody use it), but got rid off that horrible app (and same with extended family where I promoted it) and there is nothing else which I could use for SMS and IM at same time. It would be killer feature, since I must have some SMS app in phone anyway, so why not have IM app which can handle also SMS, but Signal won't touch my phone again.