You can easily stop your iPhone or iPad screen from turning off automatically or increase the auto-shut off time, in case you are bothered by how quickly your iPhone goes into sleep mode while you are still in the middle of using it.
iPhone Screen Auto-Lock Feature
Your iPhone or iPad by default is set to turn off or go into sleep mode after a certain period of inactivity. This setting is designed to conserve battery life and it also reduces the chances of unauthorized access to your device, in case you leave it unattended.
As you must have noticed, your iPhone is smart enough to automatically disable sleep mode whenever you are performing activities like watching a movie or a music video.
However, for most other activities the default auto-lock setting is one minute, which can get quite annoying in case you find yourself constantly having to unlock your phone while you are still in the middle of using it.
Note: While in sleep mode, your iPhone can still connect to the Internet, get calls, receive messages, and run apps in the background.
Stop iPhone Screen From Turning Off Automatically
Follow the steps below to stop your iPhone or iPad from going into sleep mode, so that you can keep using your device without any interruption.
1. From the home screen of your device, tap on Settings.
2. Next tap on General.
3. Tap on Auto-Lock (See image below).
4. Select Never to prevent your iPhone screen from turning off automatically (See image below).
Instead of completely turning off the Auto-Lock feature, you can try to increase the duration before which the sleep mode kicks on your device by setting the Auto-Lock to something reasonable like 2 minutes or anything that suites your requirements.
Note: Keeping the Auto-Lock Setting to “Never” makes it prone to the possibility of unauthorized use in case you happen to leave your phone unattended.