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> If the will was really there I'm pretty sure this problem could be tackled.

Probably, but not with any of your proposed methods. I have talked with some SMS spammers and none of what you proposed would affect them. And for SMS spammers these inconveniences are a much bigger part of the cost of doing operations than for a company which needs to have employees in a call center. They have to spend a lot of money on buying new SIM cards as old ones get blocked.

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SMS spammers could be tackled with a couple of regexps if the will was there. The fact that these scams still work is a sign to me that there simply is no will to tackle any of this at the telco level. They know exactly what is going on.

Lots of telcos are doing exactly this, doesn't really work very well. The spammers just switch to more generic messages you can't realistically filter out.

There is already keyword filtering. Try using the word "election" in SMS at a certain time of year. A certain US political party complained about this. E2EE is not compatible with content based filtering.

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