AT&T promotes Thaddeus Arroyo to CEO, Iusacell; former CEO Adrian Steckel to help him with integration of the company into AT&T, which just completed the acquisition ... Morrison & Foerster names partner Andrew Serwin co-chairman, Global Privacy and Data Security Group ... RealNetworks hires Marjorie Thomas, ex-Intuit, as chief financial officer and treasurer, effective Feb. 4, succeeding Tim Wan, who relocated to the Bay Area ... Vubiquity hires Michele Edelman, ex-Warner Bros., as executive vice president-marketing and communications ... Lobbyist registrations: American Tower, Brownstein Hyatt, effective Dec. 4 ... Consumers Union, Etka Consulting, effective Jan. 1 ... Electronic Funds Transfer Association, Capitol Counsel, effective Jan. 1 ... National Rural Electric Cooperative Association, Prime Policy Group, effective Jan. 1.