The iPhone 17 and 17 Air may have 120Hz displays, but without the ProMotion features
Briefly

While the iPhone 17 series is expected to feature 120Hz displays, these may not utilize the ProMotion technology familiar to some models. ProMotion allows variable refresh rates (between 10Hz and 120Hz), which contribute to improved performance and battery efficiency. The higher-tier iPhone 17 Pro models are anticipated to incorporate LTPO technology, enabling lower refresh rates to conserve power, particularly beneficial for the Always-On Display. However, the iPhone 17 and Air may settle for fixed refresh rates without the full ProMotion experience.
However, there is more to ProMotion than just the top refresh rate frequency - it has a wide range of frequency options, ranging from 10Hz to 120Hz on the iPhone 13 Pro.
Meanwhile, the iPhone 17 Pro and 17 Pro Max should have LTPO panels that can save power on static content by going below 60Hz - this is especially useful in Always-On Display mode.
Read at GSMArena.com
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