Free Press, Public Knowledge and the New America Foundation’s Open Technology Institute notified AT&T on Tuesday that they will soon file a formal complaint with the FCC against AT&T’s recent decision to limit access to Apple’s FaceTime mobile video chat app to customers who subscribe to one of AT&T’s new “Mobile Share” data plans. Although subscribers with the Apple iPhone have been able to use the preloaded FaceTime app through Wi-Fi connections, the new Apple iOS 6 mobile operating introduced on Wednesday enables FaceTime to work over cellular networks. Anticipating the debut of Apple iOS 6, AT&T announced last month that only customers who subscribe to the company’s shared data plans will be able to use FaceTime over the AT&T network. Describing its policy as consistent with FCC’s rules that “do not regulate the availability to customers of applications that are preloaded on phones” AT&T said last month that customers still have the option to use FaceTime over Wi-Fi connections or to download and use other video chat applications on the AT&T network. However, in a letter informing AT&T of their impending complaint, the public interest groups condemned AT&T’s pronouncement as a violation of the FCC’s 2010 net neutrality order, “which prohibits mobile broadband Internet access service providers from blocking any application that competes with the provider’s voice or video telephony services.” As Free Press policy director Matt Wood characterized AT&T’s actions as “incredibly harmful to all of its customers, including the deaf, immigrant families and others with relatives overseas who depend on mobile video apps to communicate,” an official of Public Knowledge vowed to reporters that his organization “intends to follow the process the FCC established to make sure AT&T follows the law.”