It’s been less than two years since Verizon first lit up its 4G LTE network, and there’s little question that its been growing at a quick clip. To wit, Verizon Wireless CTO Nicola Palmer at MobileCON in San Diego announced the carrier will light up its 400th LTE market (Marquette, Michigan)on October 18, well ahead of the “end of the year” timeframe the carrier previously forecasted.