Wrong they can calculate the cycles. You can see them with third party tools. Those tool only read data already present in the iPhone.Good information to have access to along with being able to restrict to 80% charge.
The only explainations I can think of for it not coming to older models is because Apple has no way to calculate the cycles for older devices that have been used for months/years but with iPhone 15 it's a brand new device that comes with iOS 17 out the box so as soon as you start using it then it will keep track of cycles.
most likely reason is they want you to buy an iPhone 15 lol. If they can bring it to older devices they might do it in the future if enough people pressure them.
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