The FBI, Homeland Security and police are investigating a suspicious purchase of cell phones at a Wal-Mart in Caro, Mich. Three men were arrested Friday on suspicion of buying more than 1,000 cell pones, Local 4 reported. The Nokia Tracfones cost about $20, and customers receive a phone plus 40 minutes of airtime. Also, the phones do not have to be registered to a name, the station reported. These are the same type of phones connected to terror charges against two Dearborn men arrested in Ohio, according to the station's report.