How to Remove iClould Account form Apple iPhone
If you have already sent in your device please follow the below steps to remove iCloud from your iPhone:
Step 2
Select the device from the Find My iPhone device list by clicking All Devices
Step 3
Erase the device by clicking Erase iPhone
Step 4
Click Erase to erase all contents and settings from the device
Step 5
Enter your Apple ID password to continue
Step 6
When prompted, do not enter a phone number or message. Click next and then done until the device is erased
Step 7
When the device is erased, click Remove from Account
Step 8
Confirm the removal
Activation Lock should now be removed from your device.