The second-largest wireless carrier in the U.S. is offering double the data on its shared mobile plans, but those hungry for a bit more data in their lives have just a month to secure AT&T's deal.

The double data promotion is good for shared consumer plans that have between two to 10 lines. A similar deal is available to business customers.

"We're now making our simple and flexible plans a greater value by doubling the data for the same price," said AT&T Mobility CEO David Christopher. "Families and small businesses can share a huge bucket of data on the nation's most reliable 4G LTE network, which now covers more than 300 million people. With these new double data plans, and smartphones for $0 down with AT&T Next, there's never been a more affordable time to be with AT&T."

AT&T customers, or those who'd like to be, have until Oct. 31 to sign up for the deal or they'll be doomed to just half of what could have been for who knows how long. The offer includes unlimited talk and text domestically, as well as unlimited international messaging from the U.S. to select countries.

The promotion pushes a coupled account from 15 GB of data to 30 GB; three to four lines to 40 GB; five to six to 60 GB; seven to eight to 80 GB; and nine to 10 grouped accounts double to 100 GB of data.

There's a lot of fun and productivity to be had with 30 GB of data, says AT&T. A pair of consumers can surf the Internet for 600 hours, stream 40 hours of video, stream 250 hours of music, upload 1,000 photos, download 200 apps and send 1,000 emails weighted by attachments, according to AT&T.

AT&T has been reworking bundles and creating new ones a lot recently, though many of them take the shape of formulas already rolled out by other carriers. A few days before announcing its double data promotion, AT&T revealed that it could come up with a "skinny" bundle of its own.

AT&T's HBO deal is a value-packed lure that could reel some cord cutters back to traditional models for television programming, specifically its U-verse service.

The HBO bundle includes U-verse cable and Internet service, a year's worth of Amazon Prime membership and HBO for just $40 a month. The Amazon Prime membership costs $99 outside of the HBO bundle.

There is a catch to the HBO bundle's allure. The bundle's $40-per-month cost morphs back to its true price after 12 months, leaving customers to pay full price for the services.

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