Each Android phone requires a gmail account. Whoever is using the phone would have to establish the gmail account to register the phone. That person would know the gmail address that they established. You would have to ask them. They may or may not want you to have access to their calendar.
Good question cpaine! Are you trying to find a Gmail / Google email address for your device or for another user’s device? Do you want to add or remove the email account to your phone? If so, what type of phone are you using so I can provide you the correct steps? Thanks!
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