I was searching this out a bit. So its not just whether the Android users provider is offering RCS & setup for the Apple part, the Android user has to be using the Google Messages app. But if the users are still using the old Samsung messaging app or a 3rd party app they swear by (there are some apparently), it won't have RCS support for that Android user.I think it is not on by default as all android users are also in hands of second evil empire for long so ability to message iPhones directly may make them slowly adopt this way as well.
Now Google Messages is the default messaging app these days over in Androidville, but there's plenty of ways for users to not be using it and missing out on this upgrade to iPhone user messaging they have.
Its such an odd thing isn't it? My guess is it really comes from how the rest of the world (typically countries where you were much more likely to call / message outside the country since they weren't continent sized) were getting expensively billed if they called or messaged outside their country by their own phone systems - and WhatsApp came at just the right time to offer all those folks a free way to call / message over the internet - boom, almost the entire world used it.It’s always amazing to me how important the messaging app is to the USA, while all of us in the rest of the world keep using WhatsApp and wonder why Apple invests so much in the SMS login codes delivery app.
Except the U.S. (and Canada) as the example here was so big the amount of people needing to do out of country calls was small - so the default 1st power on messaging app worked, for pretty much everyone here and still does. RCS brings the base level of messaging features from the 1990's to ~ 2008 when RCS came about. But that's a huge bump in base standards for messaging between platforms here, so its a big deal.
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