AT&T (NYSE: T), which currently sells netbooks in Atlanta and Philadelphia and through RadioShack and Costco, has decided to begin selling them in all of its stores. “Ralph de la Vega, the head of AT&T’s consumer business, said on Tuesday that the U.S. phone company would directly sell netbooks from Dell Inc, Acer Inc and Lenovo Group Ltd starting this summer” reports Reuters. The telco hopes to expand the use of its data network past mobile phones and will likely use the same model—subsidizing the cost in exchange for customers signing a 2-year $60-a-month contract. AT&T is currently testing a $40-per-month fee for 200 megabytes of data downloads to netbooks, or about 1/25th of the downloads allowed under the $60 service. Verizon (NYSE: VZ) has announced similar plans.