AT&T Mobility (NYSE:T) is expanding its WiFi Hotzone project in hopes it will ease the burden on its 3G mobile broadband network. The company has launched a WiFi Hotzone pilot in Charlotte, N.C., and will also bring the program to Chicago in the coming weeks. AT&T has already deployed the project in Times Square in New York City, and said it is adding the additional WiFi capacity in areas with consistently high 3G traffic and mobile data use. Release