This past Saturday, an iPhone was bought in the Sunnyvale, California Apple store. What made this iPhone special was the IMEI number printed on the back. The number on the back was 01 171400 6049xx x (last 3 digits edited out).
MacObserver and Investor Village takes these IMEI numbers, puts it in a spreadsheet, and deciphers the meaning of them. Using this number, it was discovered that Apple Inc. (NASDAQ:AAPL) manufactured over 5.65 million iPhone 3Gs on top of the 2.4 million first generation iPhones. This makes the number of manufactured iPhones at 8 million in the last year.
Given the current production rate of the iPhone 3G, it is expected that 10 million iPhones will be manufactured by the end of September. This is well ahead of investor expectations.