FAR 121.542(d), effective 14 Apr 14:
(d) During all flight time as defined in 14 CFR 1.1, no flight crewmember may use, nor may any pilot in command permit the use of, a personal wireless communications device (as defined in 49 U.S.C. 44732(d)) or laptop computer while at a flight crewmember duty station unless the purpose is directly related operation of the aircraft, or for emergency, safety-related, or employment-related communications, in accordance with air carrier procedures approved by the Administrator.
From FAA InFO 14006 of 20 May 14:
• This prohibition includes any personal use by flightcrew members of these devices, including, but not limited to, talking, texting, bidding for schedules, reading or accessing the Internet. In other words, all personal use is prohibited, whether or not the device is in “airplane mode”.
• “FAA approved operational procedures” (e.g., use of electronic flight bags, digitized charts or manuals) are those procedures that have been developed by the air carrier and have been approved/accepted, as appropriate, by the FAA.
• This prohibition does not apply to a person occupying a flight deck jumpseat.
• The prohibition applies regardless of any “ownership” test. The rule does not differentiate between devices owned by the air carrier or the flightcrew member. Rather, the rule requires a “use” test. These devices (regardless of ownership) may not be used for personal use during aircraft operation but may be used only in accordance with FAA approved operational procedures, as defined above.