How do I add a 2nd email address to my iPhone 6 plus?
How do I add a 2nd email address to my iPhone 6 plus?
[Re-Titled by Moderator]
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Add an email account to your iPhone, iPad, or iPod touch - "There are two ways you can set up an email account in the Mail app on your iOS device—automatically or manually. Learn which option is best for you."
https://support.apple.com/HT201320
If you mean add a second Apple ID, iPhones are designed to only be used with a single Apple ID.