Regarding the iPhone 15 series and iPhone 15 Pro series, which are rumored to have manufacturing issues, Keizai Daily reported that the issues with the iPhone 15 Pro series are expected to be resolved first.
iPhone 15 Pro Display Manufacturing Issues May Lead to Limited Supplies at Launch
Problems manufacturing a key component could lead to a shortage of iPhone 15 Pro and Pro Max models - PhoneArena
Warning Signs Grow Apple Is Losing Chinese Consumers to Huawei - BNN Bloomberg
iPhone 15 Pro and Pro Max display manufacturing woes could impact launch supplies
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The iPhone 15 Pro may fix every design problem I've had with Apple
Apple iPhone 15 Pro series may face shortages over display production issues - Gizmochina
iPhone 15, iPhone 15 Pro Release Problems Hit Apple's New iPhones