Another possible solution: Government enacts a law that telecom companies MUST ensure that SenderID is valid for the company that sends the SMS.
It’s profitable on multiple levels to allow this, so corporations ensure the political class doesn’t enact legislation for consumers.
I don't use WhatsApp, so with people who do not have Telegram I use SMS. The more annoying and conotated with spam SMS is, the more pushy people become with insisting on WhatsApp. Luckily I'm often in a position to absolutely resist, but I can see how others, such as job hunters or Tinder hookups, would be pressured into installing the spyware.
This is not being done by Facebook/WhatsApp themselves, but keeping SMS annoying is certainly in Facebook's interest.
They haven't gotten to blocking messages that don't register but have raised the fees and fines for folks who don't register and they're able to track down.
The main use case for this is redirection, when I get a call from A to my office O, it will also call my mobile phone M, but it is my PBX at O that start the call, so normally I would have O as caller on my phone, but I want A, so my PBX must be able to set the caller ID to A. I cannot use redirection at the carrier level, because a number might redirect to multiple mobile phone at the same time or recording the call or any feature that are provided by a PBX.
I guess this is a very common use case and it make it trivial to spoof caller ID.
There is an easy fix to this and I believe Twilio does this ...
You allow senders to announce CID for any number they have validated with your service (in this case, Twilio) ... so you prove to Twilio that you control that number and they they let you set that number as CID.
Seems like a very simple and elegant solution ... and allows for the use-cases that you are alluding to.
Now the states get the choice to regulate women's bodies
Ugh
But yea, trigger laws enacted have now regulated women's bodies in something like 15-20 States or something? It's disgusting