How to Switch to Four-Digit Passcode on iPhone or iPad

Whenever you set up a new iPhone, it will prompt you to enter a six-digit passcode after which you will have to set up Face ID or Touch ID. Up until iOS 8, Apple used a four-digit passcode but switched to a six-digit combination since the release of iOS 9 as it is more secure and complex. If you have already set up your iPhone or iPad with a six-digit passcode and now want to use a four-digit passcode on it, follow this guide.

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