I would like to upgrade my child's gizmo watch to a regular cell phone, but I want to keep the same phone number. When I went to a store, the Verizon rep said it's not possible to keep that same phone number, and you can only cancel the gizmo and get a new line with a new number. Can I keep the number but upgrade her line? We love the number associated with the gizmo watch. If we cancel the gizmo, what happens to that number?