Here ya go:
The next time you get a spam message or you just want to block a new enemy or annoying family member from texting you, text the words
block [insert number here]
. Within seconds, you'll get a SprintFreeMsg response from the 9999 number confirming that all text messages from the indicated number will be blocked. You can also text
spam [insert number here]
to have Sprint "investigate" the number.
As far as Spam text send them to 7726, It goes to a national database that the major carriers are strting to use to try help cut down on spam text accross all carriers. It also blocks that number from sending you anymore spam text.