Write an article based on this "Find the number that was used to send the text. Write a new text message. Add 9999 as the recipient. Type the word block into the body of the text message. Add the number or shortcode in brackets. Send the text message."
Text numbers are often abbreviated numbers, rather than 10 digit numbers. This is called the shortcode. Use your default text message app to create a new text message. This is the Sprint Free Message service that blocks text numbers. This tells Sprint that you wish to block the number. You can use the 5 digit shortcode or phone number. For example, " block <1234567891>." This code must be at least 4 characters long. This will block the number from sending you text messages.