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.

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Apple Retail Staff Told to Warn Against iPhone Duo Walk-In Purchases

Some Apple retail employees have been told to warn customers against visiting to purchase an iPhone Duo without a pre-order on Friday, October 23. Apple Store employees told MacRumors that they have been advised that there will likely be no iPhone Duo stock available for walk-in purchases on launch day.…