Ask HN: How can I stop getting spam SMS?

I keep getting spam SMS messages. This drives me nuts, because 1) I'm being charged for those and 2) the carrier doesn't provide a spam filter or let me provide my own.

I'm pretty sure that those two things are related.

Does anybody know a solution for this, or do I just have to hope I can start a movement and yell loud enough to get them to fix it?