Adding a number to a Spam List makes it impossible for that number to reach you again via text or phone call.

You can add a number to the Spam Number List directly from your personal inbox. All you need to do is make sure that you are in the Inbox tab and find the spam number you want to block.

Once you find your target, click on the existing message with that person, and the menu will look like this:

Press the Actions button above the conversation. Scroll down to the option 🚫 Mark as Spam. When you select this, the phone number will be added to your Spam List. That number will now be blocked from texting and calling you.
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All of the phone numbers marked as SPAM can be found in the Spam Numbers, which are only visible to users with granted permissions of your smrtPhone account.