IPhone iMessage disable after THAT text?

So someone decided to be a wiseguy and send me that text on my iPhone that disables it. My messages can't even be opened and i'm getting no notifications… Please help me)

Double tap the home button and get rid of the messages app by sliding up.
Then HOLD the power button and the home button. Your phone will turn off.
Then go into contacts and just click any contact and click the little speech bubble. It will take you into the messaging app.
Click cancel once in the messaging app.
and delete the message that your friend sent you by clicking edit and selecting the chat or siding your finger to the left and clicking delete.

DO NOT go back into the message, you need to delete the entire chat.

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