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Your carrier would have to support RCS, right? Do any EU carriers do that?

Even carriers that supported RCS, like Vodafone, have shut it down https://9to5google.com/2023/03/27/vodafone-rcs-messages-andr...

Apple won't make the iPhone fall back to sending RCS though Google servers (like Android does) if there isn't carrier support for it, they'll just say "there is no RCS support on your carrier" and go for SMS.

I'm not sure it would follow. as part of the act is to allow other apps to request interop in these services like iMessage or WhatsApp.

But I guess it was worth to try this instead of directly opening iMessage for interop, for business reasons.

iPads can do iMessage. iPhones with no phone plan can do iMessage. iPod Touches, used to be the cheap messaging devices for kids before phone plans became more widespread. Macbooks. Those cannot send or recieve SMS/RCS.

And last but not least iMacs, Mac minis, Mac Studios and Mac Pros.

The word "Mac" encompasses all of those, just fyi.