Find My features allow you to manage your device in a secure way. If you have it turned on, you can use it to help find lost or stolen devices.
From your Home screen:
Before you start, make sure you have your screen lock enabled, and a Google account added.
Use Device support to get step by step instructions for your phone.
Important: If you’re returning, selling, or giving away your device, you must turn off Find My for your device. You’ll have to erase all content and settings from your device before handing it over. Keep in mind, erasing this will completely erase your device, turn off Find My, and remove the device from your account. Failure to disable Activation locks will result in a significant reduction in trade-in value.
Device reset: You can also disable Find My iPhone/ iPad by resetting your device. From your Settings, select General, then Reset, and Erase All Content and Settings.
Use Device support to get step by step instructions for your phone.