There are some options you can try: 1. Check if your phone has a spam filter feature that can automatically block unwanted messages. 2. Contact your mobile service provider and ask if they offer a service to block specific numbers or types of messages. 3. Install a third-party app that can filter out unwanted messages based on keywords or sender information. 4. Adjust your messaging settings to only receive messages from contacts in your phonebook or whitelist certain numbers that you want to receive messages from.