Apple has launched the 3G iPhone in 21 additional countries today. We’ve previously covered the full list of receptive countries, so take a gander if you’re interested.

The initial 3G launch on July 11th, which took place in 22 countries, had a combined mobile subscriber base of 370.5 million, according to Piper Jaffray. With the addition of 21 new countries, bringing the total to 43, the iPhone 3G now has a potential consumer base of over 660 million users.