AT&T is purchasing satellite TV operator DirecTV for $48.5 billion. The deal will add DirecTV’s 20 million subscribers to the five million already signed up to AT&T’s U-verse TV service. If the move is approved by regulators, AT&T will become the country’s second-largest pay TV provider, behind Comcast, and will be able to package phone, high-speed Internet and pay-TV services. Regulators have expressed growing concern that the nation’s TV and Internet services are increasingly controlled by a handful of corporate behemoths. Comcast agreed earlier this year to buy Time Warner Cable, and Sprint wants to merge with T-Mobile.