Use a hand-held mobile telephone
Use a hand-held mobile telephone means:
(1) Using at least one hand to hold a mobile telephone to conduct a voice communication;
(2) Dialing or answering a mobile telephone by pressing more than a single button, or
(3) Reaching for a mobile telephone in a manner that requires a driver to maneuver so that he or she is no longer in a seated driving position, restrained by a seat belt that is installed in accordance with 49 CFR 393.93 and adjusted in accordance with the vehicle manufacturer's instructions.
49 CFR § 390.5
Unless specifically defined elsewhere, in this subchapter: