When you remove an iPhone from your Apple ID, it is no longer associated with the Apple ID. And it will no longer appear in your Apple ID device list. Other important changes are like:
Because the device has been removed from your Apple ID, iCloud features associated with that Apple ID will no longer work on the device. You can no longer back up the device's data through iCloud or sync data to other devices through iCloud. The "Find My iPhone" feature will also be disabled. You can't remotely locate, lock, or erase the device through your Apple ID.
After changing your Apple ID, apps previously downloaded with the old ID may need to be updated or re-downloaded. This depends on the app's authorization and update policies. If you want to add the iPhone back to your Apple ID in the future, you can log in to your Apple ID again on the device. After logging in, you can re-enable iCloud features and other related services as needed.
Removing an iPhone from an Apple ID will cause the device to be unlinked from the Apple ID. It affects the features and services associated with the Apple ID. Before doing this, please think carefully and back up all important data. You can use a professional backup tool to do this. EaseUS MobiMover can help you back up your iPhone/iPad in one click. With it, you can selectively transfer data from iPhone to computer. With such a tool, even if your device is removed from the Apple ID, the data on the device can be retained.
Here is how to back up iPhone with EaseUS MobiMover.
Step 1. Launch EaseUS MobiMover and connect your device to the computer.
Step 2. Tap the "Backup Manager" > "Backup" mode.
Step 3. Click the data type you want to back up.
Step 4. Click "One-Click Backup" to start the backup process.
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