[1]
AT&T smartphone users can currently get 1,000 free rollover minutes just by texting the word “yes” to 11113020. After sending your text, you will immediately receive a confirmation text. You can expect it to take approximately 4 weeks for the free minutes to post to your account.
I’m not sure how long this deal will last, so make sure to do it right away!
(Thanks Dealyo [2]!)