On November 18th, AT&T launched a new promo offering a data plan that included 15 GB of shared data for only $100 per month. The normal price for a 15 GB data plan on the carrier is $130 per month. The special promo was available to both new customers and existing customers. A mere 13 days later, on November 30th, AT&T brought the limited time deal to a close.
An AT&T spokesperson, Steven Schwadron, declined to comment on why the carrier decided to run this particular promotion for a such a limited period of time, not even two weeks. He did indicate though that AT&T runs “limited time promos all the time.” It could be the carrier was attracting too much interest in the plan for users wanting to up their data limit or AT&T could be preparing for a new promo to take place later in December in conjunction with Christmas.
source: Fierce Wireless