Okay looks like it’s 1179 x 2556, for the standard iphone 15.
I’ll also leave the other 15-model sizes here just in case, as I advocate for other interested lurkers who likely have larger screen sizes. I’m sure I represent the smallest marketshare 😅
iphone 15:_________1179 x 2556
iphone 15 Plus:_____1290 x 2796
iphone 15 Pro:______1179 x 2556
iphone 15 Pro Max:_ 1290 x 2796
Oh. Well looks like there’s only two sizes here lol. Interesting!