The upcoming iOS 13 isn’t compatible with all iPhone models. Here are the COMPATIBLE models:
iPhone XS Max
iPhone 8 Plus
iPhone 7 Plus
iPhone 6s Plus
The listed compatible models are those released during 2015 or later. Of course, the upcoming 2019 iPhones will be compatible as well. The final version of iOS 13 is expected to become publicly available at the 2019 iPhone launch, in September.
So, iPhones which ARE NOT COMPATIBLE with iOS 13 are those released before 2015, such as the iPhone 6, 6 Plus, 5S, 5C, 5 and of course models that are even older than them.
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