A cell phone dropped at the scene of two auto burglaries in west Santa Rosa led to the arrests of three people over the weekend, police said today.Police responded to a report of a prowler at a home in the 1900 block of Peterson Lane around 3:45 a.m. Saturday, Sgt. Lisa Banayat said. Residents went to investigate noises in their garage and startled the suspects, who fled, Sgt. Lisa Banayat said. One dropped a cell phone. The suspects had burglarized two vehicles in the garage, and police found other cars with their doors open in the neighborhood, Banayat said.Officers responded at 6 a.m. to another auto burglary in the 1600 block of nearby Woodhue Avenue, where a portable two-way radio and a firearm had been taken from a locked car, Banayat said.Using the dropped cell phone, police developed leads on potential suspects and within the next 48 hours searched several homes, Banayat said. Police found the stolen radio at one home and arrested a 14-year-old suspect.Police then identified two more suspects, including another juvenile, and recovered the stolen gun and additional property taken in other auto burglaries, Banayat said. Police arrested Nicholas Torres, 18, of Santa Rosa for burglary on Sunday, Banayat said. He was booked into the Sonoma County jail. The two juveniles, ages 14 and 17, were taken to the Juvenile Justice Center. The 14-year-old was arrested for burglary and possession of stolen property, and the 17-year-old was arrested for burglary, Banayat said.