iPhone helps track down armed robber

A 30-year-old man robbed at gunpoint of his iPhone got it back when Chicago police used a tracking device to find the phone after it was sold to someone on the street.
Police arrested a suspect, a 16-year-old boy who was charged today with armed robbery.
Armed with a TEC-9 gun, the robber approached the man about 4 p.m. Tuesday near 107th Street and Wentworth Avenue in the Roseland neighborhood. Authorities said the robber made off with the iPhone and some cash. The victim was not hurt.
Officers from the Calumet District tactical unit responded to the scene a few minutes later. An officer who owned an iPhone activated his "Find My iPhone" application, entered the victim's phone information and learned the stolen phone was about four blocks away at 103rd Street and Wentworth.
Once at the location, the officer again activated the application on his phone. That's when the other officers heard a "beeping" sound coming from outside a store not far from the intersection.
The sound was coming from the victim's iPhone, which was being held by a person standing in front of the store.
When the Police rushed over to question the person, he explained he had just purchased the phone for about $140 from a boy riding a bicycle, authorities said. He gave the officers a description of the boy.
The boy was briefly seen by the Police riding his bike before they lost sight of him. But they found the bike in a yard outside a home near 107th and Wentworth.
Officers went to the home and its owner, an acquaintance of the robber, gave them permission to search it, authorities said. They found the boy in a room pretending to be asleep and placed him under arrest.
The officers found a TEC-9 in a closet.
The victim identified the boy as the robber, authorities said. The person who bought the stolen phone also identified the robber.