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As far as I know you can. If you return the phone within the 7 days, the new "contract" is cancelled and you go back (by default) to your old plan. I would call Orange, let them know that you want to return the upgrade, and you would like to request a PAC. They will no doubt put you through to the retentions team. If you do have any thought to stay with Orange and try to grab a good deal, this is the team that can do it.