Adding an existing email account to your iPhone allows you to check all of your email notifications in one central location through the Mail app.
iPhone steps:
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Open Settings; Tap Mail
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Press Accounts
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Tap Add Accounts
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Select your email provider (If you don’t see your provider, click on others)
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Enter your email and password to log in
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Choose information from your email account you would like to sync with your device
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Click Save
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