Google's promised Nexus phone may be one of the most advanced phones ever when it ships this fall, according to a detailed rumor on Wednesday. Tentatively called the Nexus 4G, it would be a centerpiece for Ice Cream Sandwich's all-touch interface with a "monster-sized," 720p screen. It would also pack LTE-based 4G and could even be the first cross-carrier LTE device since it will follow after AT&T's LTE network launch.