AT&T Inc., the biggest U.S. phone carrier, said second-quarter TV and Internet subscriber growth improved from a year earlier.

The company also expects to report 500,000 new mobile-phone subscribers signed up for contracts during the quarter, it said Thursday in a statement. While profit margins in the wireless business will be similar to the first quarter, overall margins will decline from a year earlier because of "customer additions and investments in new growth opportunities," it said.

AT&T continues to expect revenue growth in 2013 of more than 2 percent, it said. The company is counting on video and Internet service in its landline and wireless businesses to fuel growth as the traditional phone business subsides.

The carrier, based in Dallas, also expects to report an additional $1 billion in cash proceeds from the sale of America Movil SAB shares and a distribution from YP Holdings LLC, the yellow-pages publisher in which it still holds a stake.