Columbia subject headings:
Harvard subject headings:
Cell phone systems--Law and legislation--United States.
Confidential communications--United States.
Eavesdropping--United States
Privacy, Right of--United States
Radio--Monitoring receivers--United States.
Princeton subject headings:
Cell phone services industry--United States.
Cell phone systems--United States.
Cell phones--United States.
Confidential communications--United States.
Eavesdropping--United States.
Privacy, Right of--United States.
Radio--Monitoring receivers--United States.
Wireless communication systems--United States.