this post was submitted on 12 Oct 2023
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I don’t see any public license for GSMA Universal Profile and it seems you have to engage directly with GSMA to get any detail on the standard. Very much the opposite of things like Signal which not only are the standards public but so are the reference implementations.
I still don’t see an argument for why yet another proprietary standard and protocol is a good thing.
well RCS is to be the successor to SMS, which I believe was also introduced by GSMA
What you are using on Android isn’t RCS, it’s RCS+Google’s proprietary extension. There is no encryption in the spec, and the original implementation that went through carriers is ignored and it goes through Google. It’s essentially Google’s iMessage and they are trying to find their way into breaking Apple’s market share under false pretense.
I know, but isn't the point that Google Messages is interoperable with other implementations such as T-Mobile's or Verizon's?
That may be the point, but it’s not working out that way. The spec is older than iMessage. It failed. Google just took it and made their own implementation. I’m not sure if Google’s RCS works with Verizon’s for example, I’m sure basic things do. AFAIK third party developers can’t implement it in their apps, so you have to have an Android phone to use it. Someone correct me if I’m wrong. The entire thing relies on Google to keep it running.