- Bring up the text message in Messages and be sure not to click any embedded URLs in the message.
- Tap Edit.
- Tap the empty circular (radio-style) button to the left of the unwanted message. The Forward button activates.
- Tap the Forward button.
- Enter 7726 (the numeric equivalent of the letters S, P, A, and M on a telephone keypad) and tap Send.
- AT&T responds with a message asking you to send the number from which the message originated (this and the spam report are cost-free if you have a limited message plan).