According to ChainCatcher, the FBI warns smartphone users to be aware of nationwide scam activities, where scammers impersonate the FBI and other law enforcement officials to deceive victims into sending money. Scammers use deceptive caller ID technology to disguise themselves as FBI phone numbers, falsely claiming that victims will be arrested unless they pay immediately. The FBI emphasizes that it does not request payment over the phone to avoid criminal charges. Scammers use intimidation tactics, requiring payment via prepaid cards, wire transfers, cash by mail, or cryptocurrency ATMs. The FBI recommends that anyone receiving such calls hang up and report them at IC3.gov.