AT&T promo saves you $20 on its prepaid unlimited data plan
https://www.cnet.com/news/at-t-promo-saves-you-20-on-its-prepaid-unlimited-data-plan/
To get the deal, you have to open up a new line of service online before Dec. 26, or in-store before Jan. 10.
You can save more money if you start a prepaid plan with multiple lines.