How to change my passcode back to 4 digits
can I change my passcode back to 4 digits?
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Yes. See the following from Use a passcode with your iPhone, iPad, or iPod touch - Apple Support
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Change your passcode or passcode settings
On iPhone X and later, or iPad with Face ID, go to Settings > Face ID & Passcode. On earlier iPhone models, go to Settings > Touch ID & Passcode. On devices without Touch ID, go to Settings > Passcode.
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Change Passcode: Enter a new six-digit passcode. Or tap Passcode Options to switch to a four-digit numeric code, a custom numeric code, or a custom alphanumeric code.