PANews, June 8 - According to Forbes, the Federal Bureau of Investigation (FBI) recently issued a warning to smartphone users about a nationwide scam in which fraudsters impersonate FBI and other law enforcement personnel to trick victims into sending money. The scammers use "spoofing" techniques to disguise their phone numbers as that of the FBI, falsely claiming that victims will be arrested unless they pay immediately. The FBI has made it clear that the agency will never ask the public to pay money over the phone to avoid criminal charges.