SMSCs have had spam filters for ages and they’re very good. The telco ecosystem doesn’t mind rejecting legitimate SMSes and marking it as spam. The main reason

SMSCs have had spam filters for ages and they’re very good. The telco ecosystem doesn’t mind rejecting legitimate SMSes and marking it as spam. The main reason is that SMS is paid for as soon as it’s sent. Oligopolies and monopolies are the industry standard, which I think is more worthy of scrutiny than this well-known censorship aspect. P.S. Also, silent SMS (Short Message Type 0) is interesting. https://akaki.io/2022/transmission_and_detection_of_silent_sms_in_android https://akaki.io/2022/transmission_and_detection_of_silent_s...