Iowa Code § 727.5: Obstruction of emergency communications.

An emergency communication is any telephone call or radio transmission to a fire department or police department for aid, or a call or transmission for medical aid or ambulance service, when human life or property is in jeopardy and the prompt summoning of aid is essential. A person who fails to relinquish a telephone or telephone line which the person is using when informed that the phone or line is needed for an emergency call or knowingly and intentionally obstructs or interferes with an emergency call or transmission commits a simple misdemeanor.