Samsung is rolling out its new feature to prevent user data from getting compromised when they give their phones for service. The Maintenance mode was previously launched in Korea as the Repair mode and in China but is now available globally. However, all the devices will not have access to this feature initially. Samsung will roll out the mode in Galaxy S21 and S22 series running on the released One UI 5 and expand to its other models by 2023.
You'll find the mode in Settings > Battery and device care if your device is compatible. Once you turn on Maintenance mode and reboot your device, all your personal information will be inaccessible to the person working on repairing your phone. In addition, they won't be able to retrieve your installed apps either. The data and accounts generated by them while in Maintenance mode, and the apps downloaded from the Galaxy Store, will be automatically deleted when you exit the mode.
To exit the Maintenance mode, you can tap the mode's quick settings icon and authenticate using your fingerprint. After that, the phone reboots into normal mode, and your device will resume how it was. However, ensure your local repair shop doesn't have a blanket policy of hard resetting devices.
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