I tried that recently with some political texts. I do not recommend. It could be coincidental, but I suddenly started receiving a lot more political texts.
It might be true that I stopped receiving texts FROM THAT NUMBER, it's clearly the same organization spamming me from other numbers. Whatever. I'd rather get spam texts than robocalls.
It’s made no difference for me. I stopped replying STOP a couple mm the ago and just did report and block. The amount SMSs have increased, I get 5-10 a week.
are these unsolicited political messages? Where do you live that this is a thing? It's something I've not experienced before.
Unfortunately at best you’re opting out of one customer, not the entire sms service provider.
Don’t reply to them. See what I said in my other comment ok. How to report spam and actually make an impact on this problem:
I share the same experience. Block seems to subscribe you a deluge of crap. Similar experience with unsubscribing from emails (many of which I never subscribed to).