The option to reserve an iPhone Duo for Apple Store pickup resumed in the U.S. and Canada between 5:10 a.m. and 5:15 a.m. Pacific Time today, but inventory is extremely limited, with most stores having no pickup slots available today.

To search for iPhone Duo availability at your local Apple Stores: head to the iPhone Duo order page , select your desired color and storage and so forth, proceed to the checkout screen, and look for the pick up in-store option. Next, enter your ZIP code and you will be able to see if any models are available for pickup with a reserved time slot.

Apple Store pickup was offered for just a few minutes after iPhone Duo pre-orders began on Friday, October 16, and the option then disappeared until now.

The pickup system has also resumed in Australia, the U.K., Germany, Spain, Italy, the Netherlands, Singapore, Japan, China, and some other countries.

Just hours after iPhone Duo pre-orders began last week, Apple said demand for the device was " nothing short of extraordinary ,"…