§31‑5‑237. Use of handheld electronic wireless communication devices for electronic messaging prohibited; exceptions; penalties.
(a) No person shall operate a motor vehicle on a public street or highway while using a handheld electronic wireless communication device to write, send or read a text-based communication. This section shall not apply to a person who is using a handheld electronic wireless communication device:
(i) While the vehicle is lawfully parked;
(ii) To contact an emergency response vehicle;
(iii) To write, read, select or enter a telephone number or name in an electronic wireless communications device for the purpose of making or receiving a telephone call; or
(iv) When using voice operated or hands free technology.
(b) This section shall not apply to a person operating an emergency response vehicle while making communications necessary to the performance of his official duties as an emergency responder.
(c) Any person who operates a motor vehicle in violation of this section is guilty of a misdemeanor punishable by a fine of not more than seventy-five dollars ($75.00).
(d) As used in this section:
(i) “Electronic wireless communication device” means a mobile communication device that uses short-wave analog or digital radio transmissions or satellite transmissions between the device and a transmitter to permit wireless telephone communications to and from the user of the device within a specified area;
(ii) “Emergency response vehicle” means any ambulance, fire department, law enforcement or civil defense vehicle or other vehicle used primarily for emergency purposes;
(iii) “Voice operated or hands free technology” means technology that allows a user to write, send or read a text based communication without the use of either hand except to activate, deactivate or initiate a feature or function;
(iv) “Write, send or read a text-based communication” means using an electronic wireless communications device to manually communicate with any person using text-based communication including, but not limited to, communications referred to as a text message, instant message or electronic mail.
Source: http://legisweb.state.wy.us/LSOWEB/StatutesDownload.aspx (Title31)