You won't feel a dramatic difference in day-to-day use if you have a recent iPhone model, but it'll be noticeable if you own an iPhone 12 or older ... buying the iPhone 11 or any older model.
If you're still on an iPhone 11 or iPhone 12 series model, Apple wants you to know why you should upgrade to one of any iPhone 15 models with a new comparison tool. A student lost their iPhone ...
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