1. Short title This Act may be cited as the Wireless Resiliency and Flexible Investment Act of 2023 . 2. Requests for modification of certain existing wireless facilities (a) In general Section 6409(a) of the Middle Class Tax Relief and Job Creation Act of 2012 ( 47 U.S.C. 1455(a) ) is amended— (1) in paragraph (1), by striking a State or local government and all that follows and inserting the following: a State or local government or instrumentality thereof may not deny, and shall approve, any eligible facilities request for a modification of an existing wireless tower, base station, or eligible support structure that does not substantially change the physical dimensions of such wireless tower, base station, or eligible support structure.