Blocking one number rarely solves the whole problem
Spam operations typically send from large batches of disposable numbers, so blocking a single sender only stops that exact number -- the same campaign often reappears from a slightly different one within days. Turning on carrier- or phone-level spam filtering matters more in the long run, since it screens incoming numbers against a constantly updated list rather than reacting one number at a time.
Reporting does more than blocking alone
Blocking only protects your own inbox, but reporting a spam text to your carrier feeds that number into a shared database used to improve spam filtering for everyone, meaning a single report can help prevent the same message from reaching other people too.
Frequently Asked Questions
Does blocking a spam number also delete the messages I already received from it?
Blocking only stops future messages; existing messages from that sender remain in your conversation history until you delete them yourself.
Can a blocked number ever start texting me again from a different number?
Yes -- spam operations frequently rotate through many numbers, so a blocked sender may resurface under a new one; that's exactly why the built-in spam filter, which screens by pattern rather than a fixed block list, catches more over time than blocking alone.