Helping mobile carriers like AT&T, Verizon, Sprint and T-Mobile keep up with consumers' growing wireless Internet use is creating hundreds of jobs for companies like Colorado's Centerline Solutions that help expand network infrastructure. Vendors who design networks, install equipment on mobile phone towers and make sure coverage quality is good are in high demand from big carriers, industry, Wi-Fi network owners and local governments alike as they try to stay ahead of insatiable use of mobile Internet.