Apple Inc says today that 4 million iPhone 4S have been sold since it went on sale October 14. In-store sales began Friday in Japan, Australia, France, the UK, Germany, Canada and the US. Over 1 million orders were received online in the first 24 hours, up from 600,000 for the iPhone 4.

Taken from:
Apple iPhone 4S: 4 million sold in first 3 days