To change your iCloud account address on your iPhone, first go to Settings > iCloud > Account Details. Then tap Change Address at the bottom of the screen. You will be asked to enter a new address and verify it by entering a verification code that will be sent to your email address.
You can’t change an iCloud account without deleting the other one. The only way to do this is by restoring your device from a backup.
You can change your iCloud account by going to Settings>iCloud and then selecting “Sign Out”. You will then be asked to enter your Apple ID and password.
The first step would be to go to the iCloud account settings on the iPhone. This can be done by going to Settings, then scrolling down and tapping iCloud. Then, tap Account Info in the popup that appears. In the following screen, at the top of this screen will be a list of devices currently synced with iCloud. To remove one or more of these devices from your account, simply press the blue Delete button next to it and confirm you want to delete it.
Yes, iPhones can have two iCloud accounts. If you want to switch between iCloud accounts on your iPhone, go to Settings > Your Name > iCloud. Tap the account you want to use and then log in with your Apple ID password.
You can have two iCloud accounts, but you should be careful. You can only log into one account at a time and you will not be able to access the other account.