Change Auto-Lock time

If you leave your iPhone for a certain amount of time, it automatically gets locked and goes to sleep. The Auto-Lock time on the iPhone, which is set to 1 minute by default, can be changed to your preference from 30 seconds to 5 minutes, or "Never".

Open the "Settings" app

Home screen

On the Home screen, tap "Settings".

Tap "General"


Then, tap "General".

Tap "Auto-Lock"


Tap "Auto-Lock" under the General section.

Change Auto-Lock time


Tap on your preferred time period to place a checkmark on it.

Incidentally, if you enable iOS 9's new Low Power Mode, it sets the Auto-Lock time to 30 seconds.

New iOS 9 Feature - Low Power Mode

Auto-Lock time on iPad

As for the iPad, there are five options available for choosing the Auto-Lock time period: 2 minutes, 5 minutes, 10 minutes, 15 minutes and Never.

Basic Settings