Note You must be online when you set up Xbox One for the first time. Without an internet connection, you can’t finish setup. Without an internet connection, you can’t finish setup. After your Xbox has updated and you’ve added your profile, you can go offline.
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You can change the way you connect to the Internet at any time during your use of the Xbox One. For example, if you are moving to a new place, you may want to use a different wireless network than the one you have used in the past.
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Cant play without internet? : xboxone
You can play Xbox One games without the internet if you plan ahead. This will help you play when Xbox Live is down, during busy gaming periods or if you are taking your Xbox with you to play in a Can you use an Xbox one console without internet? - Arqade