BELFAST, Maine — Ned Lally has worked at the Airwaves U.S. Cellular store in Belfast for five years, and in that time he hasn’t seen much crime other than someone passing a bad check once. That streak snapped Wednesday afternoon. A man and woman came into the store together. While the woman disputed her phone bill and went over her account information with Lally, the man pocketed one of the store’s demo phones. “The moment when they left, we started getting this loud beep,” he said Thursday.