[remotefonts]

Do cell phone network carriers even have any part on RCS messages? If I have no wifi and no mobile data but still have minutes and sms's no RCS message will ever leave my device, so I would say all of them will go though google servers, because if they can't reach google servers they will not even leave your phone to go anywhere. Such a beautiful mess. What's not to love about it?

[dagmx]

It depends if you’re using Google’s RCS or not. Different carriers also support RCS via their servers. What you have access to depends on your device and carrier.