Jose wrote

I don't think there is an equivalent rule for part 91 ops;
the pilot is responsible for the safety of the flight,
which by default includes portable electronic devices.

Section 91.21: Portable electronic devices.
(a) Except as provided in paragraph (b) of this section, no person may
operate, nor may any operator or pilot in command of an aircraft allow
the operation of, any portable electronic device on any of the following
U.S.-registered civil aircraft:

(1) Aircraft operated by a holder of an air carrier operating certificate
or an operating certificate; or

(2) Any other aircraft while it is operated under IFR.

(b) Paragraph (a) of this section does not apply to—

(1) Portable voice recorders;

(2) Hearing aids;

(3) Heart pacemakers;

(4) Electric shavers; or

(5) Any other portable electronic device that the operator of the
aircraft has determined will not cause interference with the navigation
or communication system of the aircraft on which it is to be used.

(c) In the case of an aircraft operated by a holder of an air carrier
operating certificate or an operating certificate, the determination
required by paragraph (b)(5) of this section shall be made by that
operator of the aircraft on which the particular device is to be used. In
the case of other aircraft, the determination may be made by the pilot in
command or other operator of the aircraft.