InPhonic, which sells cell phones and wireless service plans online, plans to announce today a deal to sell Liberty Wireless, which offers pay-as-you-go cell phone services, to Vaya, a Rockville start-up firm. David A. Steinberg, InPhonic's chief executive, said the unit represents about 6 percent of the District company's revenue, but it lost money. Vaya will use some of InPhonic's services, including its billing systems. Terms are not being released until the deal closes, which is expected by the end of the year.

Tysons Corner Center had a 23 percent increase in shopper traffic over last year on the opening weekend of its 362,000-square-foot addition, managers of the McLean shopping mall said. The opening was Sept. 30 through Oct. 2.

Highland Hospitality of McLean, a lodging real estate investment trust, bought the 385-room Hilton Boston Back Bay hotel for $110 million.

iLumin Software Services of Reston, which provides software for businesses to manage and archive messages, was purchased by Computer Associates International of Islandia, N.Y., for about $47.35 million, including assumed debt.

DLT Solutions of Herndon, which provides technology products to government agencies, has been acquired by a group of its executives led by Rick Marcotte, the president and chief executive, on terms that were not disclosed.

Centurum, a systems integrator that works for federal agencies, opened a branch office in Annapolis Junction, near Fort Meade, to serve clients including the National Security Agency. The company, which was created a year ago through the merger of three smaller government contractors, recently moved its headquarters from Arlington to McLean.