Follow these steps
Depending on your device, it can take a few minutes to completely erase your data. You might need to enter your passcode and Apple ID password before you erase all content and settings.
If you don't remember your passcode for your iPhone, iPad, or iPod touch, or your device is disabled, learn what to do. Or get help if you forgot the passcode for your Apple Watch.
On your iPhone, iPad, or iPod touch, go to Settings > General > Reset. Then tap Erase All Content and Settings.
On your Apple Watch, go to Settings > General > Reset. Then tap Erase All Content and Settings.
Get help
- Learn what to do if you erased your Apple Watch and need to turn off Activation Lock. Erasing the content and settings on your Apple Watch doesn't remove Activation Lock
- If you don’t remember your Restrictions passcode or can’t access the Restrictions settings for your iPhone, iPad, or iPod touch, use iTunes to restore your device to factory settings.