About a month ago creative individuals determined that Apple has sold 8 million iPhones based on collected International Mobile Equipment Identity (IMEI) numbers. A joint project of AFB and Investor Village’s AAPL Sanity board have been collecting iPhone IMEI numbers and recording them on a big Google speadsheet. Based on the collected IMEI's, Apple was on a pace to build its 10 millionth iPhone before the end of September.
Right on schedule, it appears that Apple has already surpassed analysts estimates and built more than 10 million iPhones. The latest IMEI data collected by AFB was 9,190,680 units created which would put 3G iPhone sales at 7.6 million units and total iPhone sales at over 10 million units.
Don't expect a press release from Apple yet though, these are iPhone manufacturing numbers, not sales numbers. These calculations don't take into effect Apple and AT&T store inventory, display/demo and replacement units.