Preventing Harassment through Outbound Number Enforcement Act - Amends the federal criminal code to prohibit the modification of caller ID information with the intent to defraud or harass another person, or to use another person's caller ID information without consent. Imposes a fine and/or prison term of up to five years for violations, including attempts or conspiracies.
Exempts from such prohibition: (1) any blocking of caller ID information; and (2) any lawful investigative, protective, or intelligence activity of a federal, state, or local law enforcement agency or of a U.S. intelligence agency, or any activity authorized for the protection of witnesses in criminal proceedings.