New answers tagged authentication
This depends on the situation. IF Find My iPhone is on, he'll have to remove it from his account. Otherwise, sign out in iTunes & App Store, iCloud, FaceTime, Messages > Send & Receive, and GameCenter (can all be found in Settings, some may not be signed in). In most of these, you can tap on the AppleID: or Account: field, which shows the email ...
Go to Settings > iTunes & App Store > click on the 'Apple ID: email@example.com' > Sign Out Sign out of iCloud : Settings > iCloud > Sign Out (at the very bottom) Or you can just restore to factory settings.
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