IT House reported on June 13 that the iPhone has a "power reserve" function that retains a small amount of power. Even if the phone is turned off, it can still support functions such as "Find My iPhone" and NFC unlocking. In the latest iOS 18 system, this feature has been further enhanced on the iPhone 15 series models.
According to Reddit users, iPhone 15 running iOS 18 will continue to display the time in the upper left corner of the screen after the battery is exhausted.It’s worth noting that this new feature appears to be limited to the iPhone 15 series models. Macrumors did not see this feature on the iPhone 14 Pro Max, but it appears fine on the iPhone 15 Pro Max.
It’s unclear why it’s not compatible with older models, as the “Power Reserve” feature already exists on iPhone XR and iPhone XS.
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