Apple has announced that they sold over 5 million iPhone 5 units during the first three days of its release. In addition, Cupertino announced that 100 million iOS devices have already been updated with iOS 6.

According to Tim Cook, Apple’s CEO:

Demand for iPhone 5 has been incredible and we are working hard to get an iPhone 5 into the hands of every customer who wants one as quickly as possible. While we have sold out of our initial supply, stores continue to receive iPhone 5 shipments regularly and customers can continue to order online and receive an estimated delivery date. We appreciate everyone’s patience and are working hard to build enough iPhone 5s for everyone.”

The iPhone 5 is available in the United States, Australia, Canada, France, Germany, Hong Kong, Japan, Singapore and the United Kingdom, and will be available in 22 more countries on Sept. 28 and more than 100 countries by the end of the year. Demand for iPhone 5 exceeded the initial supply and while the majority of preorders have been shipped to customers, many are scheduled to be shipped in October.

Previously, Apple said that they had received 2 million iPhone 5 preorders. In October, iPhone 4S sales during the first three days exceeded 4 million units.

Update (from AppleInsider):

Analyst Gene Munster with Piper Jaffray believes that upwards to 1 million iPhone preorders weren’t included in these numbers. In addition, Brian Marshall with ISI Group said that Apple’s sales figures do not take into consideration units that are en route to customers. He said that Apple must have the signature of acceptance by a customer before the device can be counted as a sale.

For more information and links on the iPhone 5, be sure to read The AppAdvice Week In Review: iPhone 5, iOS 6 Debut Edition.