iPhone 17 Pro and iPhone 17 Pro Max models in the U.S. feature an antenna window on the top edge of the devices, for mmWave 5G signals to pass through.

iPhone 17 Pro mmWave 5G Window
The standard iPhone 17 does not appear to have the antenna window, while the iPhone Air does not support mmWave 5G, so it is not on that device either.

All of the iPhone 12 through iPhone 15 models are outfitted with this antenna window, which is made of glass. However, it was not present on any of the iPhone 16 models, which were the first devices to…