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AT&T said Saturday it’s starting a new promotion that doubles the amount of data offered in its upper-tier shared data plans.

So the carrier’s 15-gigabyte plans become 30-gigabyte plans. On the high end, the 50-gigabyte plans become 100-gig plans.

AT&T’s mobile share plans work like this: You pay a single base price for voice, text messages, and data. These base prices range from $130 to $365. For each additional phone you add to the plan you pay an additional fee.

Customers who sign up for AT&T’s “Next” monthly installment plan, or who bring their own device, will pay $15 per additional line. Customers who sign up for a service contract will pay $40 per month per line.

The new plan details apply to both new AT&T subscribers and existing ones. The promotion ends on Halloween.

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