Which wireless companies rest in the dead brand graveyard?

In the wireless world, branding matters. Each of the nation's Tier 1 wireless carriers spend billions each year to build brand awareness and appeal among customers. Indeed, Verizon Wireless and AT&T Mobility spent a combined $4.4 billion on advertising last year alone, according to TNS Media Intelligence. But what about the brands that have fallen by the wayside? Some brands, for a variety of reasons, simply didn't make it. FierceWireless surveys the history of now-defunct wireless brands. Slideshow