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It seems bizarre to me that Europeans have to pay for sending international SMS, it's been free/unlimited in many places for 5 years.

Will carriers charge for RCS? How has Google got them to sign up without some fee?

If you think people use Whatsapp just because of international SMS pricing then you don't really understand Whatsapp.

But that's literally what people (on HN) are saying is the reason why people can't fall back to SMS.