Delete everything on my iPhone from another iphone
Can I delete everything off my iPhone from another iPhone, or Apple product?
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With a web browser, go to: https://www.iCloud.com and sign in with your Apple ID. Open Find My iPhone and select All Devices (at the top). Then click the iPhone, select 'Erase, and select Next until the device is erased. Finally click "X" next to remove your iPhone from your account.
Also see:
Erase a device in Find My iPhone on iCloud.com - Apple Support