Whatever you do, do not reply to these texts. When you do you are confirming to the spammers that your number is real and can continue to be spammed.
All you do is copy and paste the spam in a new text message to the number 7726. Once you do, they will text you back and ask you for the number that the spam message came from. Copy and paste the number and you are done! No matter what carrier you use, it’s the same number 7726.