AT&T’s plan to build a wireless-TV bundle seems to be working

In the four months since it announced the feature, more than 3 million people have signed up for AT&T's new unlimited data plan, the wireless company said. The numbers represent an early sign that AT&T's plan to make money off of newly-acquired DirecTV may be paying off. The unlimited data plans require customers to sign up for either DirecTV or AT&T's other TV product, U-verse — effectively creating a bundle of smartphone and television service. When it first launched in January, company executives said the offering was aimed at the 36 million households that had either its wireless phone service or TV service, but not both.