Took me a while to find this since “searching up” Samsung advert song with “in it” in it brought up several songs from the usual advertisement music sites but not this one.
Turns out is “Innit Tho” by Alika
The album (Wiz) this track (Innit Tho) appears on is on Spotify, Apple music and elsewhere.
The original S20 FE 5G advert is in this tweet from Alika: