To securely wipe your phone, just follow these simple steps.
First, back up your data.
Tap Settings, go to System, select Backup and switch it on.
Keep your backup somewhere safe, as you’ll be able to restore your files on a new device.
Android 8.1 or later phones back up text messages (but not call logs) automatically.
Once your data is safe, it’s time to delete your files.
Erase any photos, documents, and downloads you have in your folders.
You might also want to sync your apps to your Google account.
Deactivate factory reset protection.
If your Android runs 5.0 Lollipop or later, your phone will have Android Device Protection.
To deactivate device protection, tap Settings, go to Security or Lock Screen Security, then
access Screen Lock and turn it off.
Log out of your Google accounts.
Tap Settings, go to Users and Accounts, select your accounts, and click ‘Remove.’
If you have a Samsung device, don’t forget to remove the accounts from your phone or
Delete any saved passwords from your browsers.
Remove your SIM and memory cards.
Encrypt your phone.
A simple factory reset doesn’t completely wipe all the data on your phone.
To encrypt your data, tap Settings, go Security, and access Encryption & credentials.
For an extra layer of security, upload dummy data before the reset.
Reset your phone to its factory settings.
Simply tap Settings, go to Backup & Reset, then select Factory Data Reset.
Remove the device from your Google account Head to your Google account’s Recently Used
Tap on the phone you are selling and select ‘Remove.’
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