why does my iphone turn back on. After I manually shut it down?

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When an iPhone turns off due to the battery draining completely, it will automatically power on once it is connected to a charger and has enough battery charge. Here are two scenarios to consider:

1. Purposefully Turned Off: If you manually shut down your iPhone and then plug it into a charger, it should remain off unless:
   1. An alarm is set.
   2. Automatic updates are scheduled.
   3. To ensure it stays off, you can try plugging it in before shutting it down or checking for any scheduled tasks that might wake it.
2. Battery Drained Completely:
   1. If your iPhone turns off because the battery drained completely, it will power on automatically when it’s connected to a charger and has gained enough power.
   2. In this case, this behavior is by design to ensure the phone can start charging and operating normally.