The iPhone 12 and iPhone 12 Pro will likely split down the middle, with release dates for the 12 coming first, then the Pro at a later date. A note came from analyst Ming-Chi Kuo on the subject, with a focus on camera quality. The issue seems to have been with the lenses used a few models when put under heat pressure – but they only seem to have failed from one supplier.

The supplier, said Kuo via 9to5Mac, appeared to have delayed some supply of two models of the iPhone 12. BUT, since Apple uses multiple suppliers for the lens that’s failed, the retail release date may be the same as Apple previously expected. At the same time, Apple’s iPhone 12 delay confirmation.
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https://www.slashgear.com/iphone-12-release-dates-may-split-for-pro-cameras-07632603/