not if you wait until the 180 day mark to make the reservation. You can then tie it to your phone number. You will not be able to make reservations at the 180 + 10 mark without a reservation number tied to it. You will either have to call each day or 180 days from the last day you want reservations for and make them all then. If you have your confirmation number you can make the reservations online with that without having to contact the person you are renting from.