AT&T today launched a limited promotion that doubles the amount of monthly data available to certain plans for no extra charge. Customers who subscribe to one of AT&T's Mobile Share Value plans with 15, 20, 30, 40, or 50GB of data can upgrade their data to 30, 40, 60, 80, or 100GB, respectively, for free. The upgrade works with plans that include between two and 10 lines and already subscribe to a minimum of 15GB ($160 per month). The promotion, which is available to new and existing customers, runs between today and October 31. AT&T said the promotional data allotments will not expire, and customers can keep them as long as they subscribe to a Mobile Share Value plan.


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