RCS has taken years to gain widespread network support, and we're still suffering through carrier interoperability issues. The current landscape is nothing if not entirely overcomplicated to navigate, especially for consumers. But the subject may become a bit simpler once Android Q rolls around, as pile of new RCS-specific APIs has popped up in AOSP, presumably bound for the next Android release. These APIs may finally provide third-party apps with the ability to work with RCS on supported carriers. 

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