If you were hoping to surprise someone with an iPhone Duo for Christmas, you might be out of luck, as Apple's online store in the U.S. is already showing an estimated shipping date of January 25 for all configurations following the start of pre-orders today.It is possible that some Apple Stores will have the iPhone Duo available for walk-in customers on Friday, October 23 launch day, but it seems likely that inventory will be very tight. For customers interested in reserving an Apple Store pickup slot, Apple's online store now says to check back on Saturday, October 24 for this.Related Roundup: iPhone DuoBuyer's Guide: iPhone Duo (Coming Soon)Related Forum: iPhoneThis article, "iPhone Duo is Sold Out for Christmas as Shipping Estimates Slip to 2027" first appeared on MacRumors.comDiscuss this article in our forums