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Not sure why you'd say "not even Verizon". Verizon is literally the worst carrier worldwide (ok maybe after NTT) with regards to interoperability.

I think they're saying that the two biggest US carriers didn't want to interoperate.

Which is insane. An SMS replacement where Verizon and AT&T users cannot message each other is insane.

Yeah, that's exactly what I meant - if those two couldn't connect their systems, who can?