CTA Tattler tells of their encounter with a blue faced US cellular walking ad-man where his blue face and annoying habit to yap loudly on a mobile phone while in transit is paid off with "Talk Until You're Blue in the Face, with U.S. Cellular." written on his backpack. Apart from the terrible pun, how annoying isn't it when people yap loudly on a mobile phone on the buses and trains? U.S. Cellular went out to highlight the worst thing about mobile phones with their dumb guerrilla stunt, and agitated people all around their messenger in the trains.