Standby is a new customizable lock screen mode in iOS 17 that only activates when the iPhone is turned sideways (i.e. horizontally) and connected to a charging cable, MagSafe charger, or Qi-based wireless charger.
Think of it as a kind of smart display for your iPhone, allowing quick access to different items that can be viewed from a distance while your device is charging in the kitchen, desk, or bedside table, for example. Information screens can be browsed.
At night, if the room you're in is dark, standby mode will dim and the display will have a red tint so it's not distracting while you sleep. It's similar to Nightstand Mode on the Apple Watch in that it does much the same thing.
If standby mode doesn't automatically activate when you connect your iPhone to a power source, make sure it's angled sideways (i.e. horizontal, also known as landscape) and upright. (i.e. not laid flat on the table).
If it still doesn't light up, make sure Standby Mode is enabled in the Settings app (Settings->Standby Mode). If the switch next to Standby is in the gray "off" position, tap it to turn it to the green "on" position, then try charging iPhone again in the desired orientation.
If Standby Mode turns itself off after a while and refuses to remain visible on your iPhone display, there are some reasons why this is happening several.
If Low Power Mode is enabled (Settings->Battery-> Low Power Mode), your iPhone screen will automatically turn off after a moment of inactivity, so it needs to be turned off Standby mode remains visible.
If Low Power Mode is disabled but Standby mode still won't stay on, check your iPhone model. Continuous Standby mode requires an iPhone with an always-on display, and this feature is only available on iPhone 14 Pro or later Pro devices.
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