iPhone
How to I change the iPhone email address on iphone6s
iPhone 6s Plus, iOS 13
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You would need to change your Apple ID or add a second one. Having two Apple IDs is not great idea. See this read on changing an Apple ID: https://support.apple.com/en-us/HT202667
And, here is what to do if you change it: https://support.apple.com/en-us/HT204071