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. You can search for iPhone Duo availability at your local Apple Stores by heading to the iPhone Duo order page , selecting your desired color and storage and so forth, and then opening the link next to the "Pickup" option at the bottom. 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…