Find my phone
If you have transferred your data and SIM card to another phone how do you turn off find my phone on the old phone so you can reset
iPhone 8 Plus
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Here's a selection of relevant articles:
Remove a device from Find My iPhone on iCloud.com - https://support.apple.com/guide/icloud/remove-a-device-mmfc0eeddd/icloud
"If you’re no longer using an iOS device, an Apple Watch, AirPods, or a Mac, you can remove it from Find My iPhone using Find My iPhone on iCloud.com or your device. When you remove a device, it’s removed from your Find My iPhone Devices list, and if your device has iOS 7 or later, Activation Lock is also turned off."
Erase a device in Find My iPhone on iCloud.com - https://support.apple.com/guide/icloud/erase-your-device-mmfc0ef36f/icloud - "If your iOS device, Apple Watch, or Mac is lost or stolen, you can erase it if you set up Find My iPhone on the device before it was lost." "When you remotely erase a device, Activation Lock remains on to protect it. "