Somewhere in China there are stacks of millions of completed iPhone 5s.

Digitimes is reporting that iPhone 5 production is at full swing with 150,000 of the devices being produced per day. That isn’t quite the “volume” production level that Apple expects as it gets ready to release its phone for the holiday shopping season, however.

We’ve also heard recently that these iPhones aren’t being boxed up just yet as Apple is finalizing the iOS 5 build that will eventually go on these iPhones.

Shipments of iPhone 5 from the supply chain are expected to reach 5-6 million in September but will then ramp up to over 22 million units in the fourth quarter as suppliers will ship fewer iPhone 4 and CDMA-version iPhones during the final quarter of the year, noted the sources.

Apple’s other manufacturing partner, Pegatron, is said to be holding off on production until 2012 and is expected to only build 15% of the devices overall.

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