this post was submitted on 10 Oct 2023
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Why should anyone care about RCS? The trend has been to get everything into data instead of carrier owned services for two decades now, we don't need another SMS (it will likely always be a fallback). What we should move onto is a carrier and device type angnostic universal standard protocol over TCP / QUIC like XMPP or Matrix, with SMS as the backup.
When you get a phone you can get an phone system account and a telephone number already. Modern apps in the Google ecosystem should already recognize you are already signed in with Google and sync your contacts. Since almost everyone is already in the Google ecosystem, if Google supported it they could have extended their XMPP implementation in Hangouts to allow messaging directly via XMPP to those contacts and SMS for anyone not yet in the system (similar to how Signal did, Apple does, and Google does now with RCS). Unlike Apple, since its just XMPP, users can still add friends and be added by friends on other XMPP servers (ex. their ISPs, their own, or a third party). They could have supported or jumpstarted a new very simple open source alternative app for that portion for AOSP if the EU complained. Eventually Carriers could have supported passthroughs for those still on feature phones and other users of SMS to use the number@carrier accounts to hit XMPP users with generated SMS numbers for non-SMS users (pushed either by business necessity or part of a government / teleco org like GSMA staged removal of SMS and telephone numbers). It's all data at the end of the day.
Instead, they developed a whole new protocol to fluff the telecos and keep the now badly managed telephone number system even more necessary allowing spammers and allow the problems of legacy SMS to continue.
Apple, Google, and Samsung should all be shamed for not supporting fully open protocols and necessitating dependency on user harming stacks.
This sounds nice at a superficial level, but there's a lot of reliability and backwards compatibility issues being ignored. During natural disasters and emergency situations, internet and cellular data are the first to fail. It's not casual. For the phone and SMS (GSMA) protocols are sturdy enough that they can operate with very simple, low energy consuming and highly reliable machines. Internet data services on the other hand consume way more electricity (more expensive to have them operate with backup generators, for example) and are more delicate and prone to failure. They also need to be replaced more often. 100% of national emergencies systems run on phone and SMS tech, that could reliably operate for several decades with little maintenance that would cost billions to replace them with internet based system that were as reliable and durable. And then on top of it all, wired phones can even operate without electricity and connect with cellular terminals to contact other phones and cellphones. Only the tower needs to have power. There's just a lot banked of that reliability that most modern conveniences don't have.
I totally agree we can't simply drop SMS immediately, but what am I missing in supporting backwards compatibility (for example via my pseudo number solution, like how VOIP works) preventing us from moving forward during a stagged shutdown in the span of decades? MMS and RCS both would also fail under cellular data loss, and SMS itself hasn't always been available during major disasters. I'm not sure I buy the argument you can't have similarly low energy towers (even with net neutrality states, you can still cap all bandwidth per user), and a simpler tower that only does data should be far more reliable than a tower that provides multiple carrier services given the simplicity (and it's very rare to have towers that only do voice + SMS anymore).
There is so much nonsense being said about RCS, it will not fail under "cellular data loss".