Request another Apple ID
How can i request another Apple ID to my IPhone because is too many now
You can only register up to 10 devices for your Apple ID, after that you'll have to create a completely new Apple ID or remove one of the devices from the list.
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You can have ten devices (no more than five computers) associated with your Apple ID for purchases at one time.
When you try to associate a device that was previously associated, you might see a message that says, "This device is associated with another Apple ID. You cannot associate this device with another Apple ID for [number] days." You might need to wait up to 90 days to associate the device with a different Apple ID.
This list of associated devices is not the same as the list of devices that you're currently signed in to with your Apple ID. You can see where you're signed in on your Apple ID account page.
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copied from: See and remove your devices that are associated with Apple ID purchases - Apple Support
