I don’t know the details but both use services from the carrier. I think google hosts for the carriers but there are checks thats rely on the carrier. If you look at the details for google messages it address specific URLs based on the carrier.

For iPhone its all carrier depend. If the carrier doesn’t support it, iPhone will not have it.

Isn’t matrix more like slack that you are looking for?

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Video on setting up next cloud on Ubuntu server 22.04

Learn Linux TV next cloud set up Ubuntu 22.04

Some steps can be skipped if self-hosting as this tutorial is more for using a hosting platform. Instruction may change when 24.04 is release.