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Please turn on his phone and go Settings > Accounts & Sync > Click on your Gmail Account > Uncheck Contacts,
turn off the phone and check contacts, let me know if you still see you contacts ?
Or press and hold on a contact and press delete to delete a specific contact
Let me know if you need further assistance
Signing out will not delete your emails contacts, you need to delete your google account, please go Settings, then account, find google and tap it, then tap your gmail account and delete it.
Has everything worked out please?
let me know the results