Exhibit 24

                                POWER OF ATTORNEY

Know all by these presents that the undersigned, does hereby make, constitute
and appoints each of Garner B. Meads, III, Jim Lundberg or David H. Bywater, or
any one of them, as a true and lawful attorney-in-fact of the undersigned with
full powers of substitution and revocation, for and in the name, place and
stead of the undersigned (in the undersigned's individual capacity), to execute
and deliver such forms that the undersigned may be required to file with the
U.S. Securities and Exchange Commission as a result of the undersigned's
ownership of or transactions in securities of Vivint Smart Home, Inc. (i)
pursuant to Section 16(a) of the Securities Exchange Act of 1934, as amended,
including without limitation, statements on Form 3, Form 4 and Form 5
(including any amendments thereto) and (ii) in connection with any applications
for EDGAR access codes, including without limitation the Form ID. The Power of
Attorney shall remain in full force and effect until the undersigned is no
longer required to file Forms 3, 4 and 5 with regard to his or her ownership of
or transactions in securities of Vivint Smart Home, Inc., unless earlier
revoked in writing. The undersigned acknowledges that Garner B. Meads, III, Jim
Lundberg or David H. Bywater are not assuming any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act of
1934, as amended.

                                         By: /s/ Dana C. Russell
                                             -------------------
                                         Name: Dana C. Russell

Date: May 17, 2022