The carrier will also expand its netbook lineup. Netbooks from Acer, Dell and Lenovo that have built-in AT&T 3G cards will be sold in AT&T's 2,200 stores across the U.S. starting as early as June.
People will also be able to buy the computers on AT&T's Web site.
The operator started selling netbooks, which it calls "mini laptops," in April in Atlanta and Philadelphia. A wide range of people, including teenagers, busy moms and small business owners, have been interested in them, AT&T said.
RadioShack already sells the Acer Aspire with AT&T access in many cities across the country.
Like cell phones, the netbooks from AT&T come with a discount when a customer signs a contract for wireless service. For example, in Atlanta and Philadelphia, AT&T is selling the Acer Aspire for US$99 with a contract that costs $40 or $60 a month, depending on data usage.