Since the 2017 generation (iPhone 8, 8 Plus, X), it has been updated to include the budget iPhone SE (2020). Previously, the video call limit was 720p.
This is not in the same position as the 12 series, which can run 1080p in 5G. Apple doesn’t think 4G is fast enough to beam up Full HD, or it’s doing a bit of product differentiation.
Anyway, older iPhones have a 7MP front camera, but most modern models have a 12MP camera (actually, everything except the new SE). This will affect the quality displayed, but 1080p should be significantly better than 720p.
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Although the hardware of the front cameras of the iPhones 12 mini, 12, 12 Pro, and 12 Pro is practically the same as the previous generation, Apple brought them a cool novelty: video calls via FaceTime in Full HD (1080p) resolution, both via Wi-Fi and via 5G.
It would be a very typical software limitation from Apple, but this time it was cool and quietly released FaceTime HD (1080p) for all owners of iPhones 8, 8 Plus, X, XR, XS, XS Max, SE of the second generation, 11, 11 Pro and 11 Pro Max.