On his first trip to New York City, Stephen Lacey takes in the frenetic pace of Grand Central Station at lunchtime on a weekday. The 13-year-old from Newland, N.C., is in the Big Apple with his mom, Debbie, and some friends on spring break. But they're not taking any chances-Stephen has a Motorola Talkabout, a two-way radio, hitched to his belt. "My mom has one too. It's in case we get separated." The sleek black gadget has a 2-mile range and doesn't require subscription to a wireless service. When he's at home, Stephen carries a Motorola StarTac phone with U.S. Cellular service. "It's for emergencies and to call in after school," he says. The Laceys are on a calling plan for families.