Its sales have officially been wiped clean.

Reports say that the newest addition to the iPhone family, Apple's iPhone 4S, has sold out for pre-order at all three U.S. carriers --Verizon, AT&T and Sprint.

Initially, customers and investors were disappointed at the announcement of an iPhone 4S. Many expected an iPhone 5, but instead, received the 4S with few external changes. Nevertheless, the 4S offers numerous new internal changes: a dual-core A5 processor, the new iOS 5 mobile operating system, an 8-megapixel camera with backside illumination and compatibility across CDMA and GSM networks.

Disappointment fled once the iPhone 4S pre-order became available Oct. 7. Within the first 24 hours of pre-order availability, Apple hit one million 4S pre-orders, which is the most first-day pre-orders any Apple product has ever achieved according to Philip Schiller, Apple's senior vice president of Worldwide Product Marketing.

It looks like another blockbuster launch for Apple, only this time with three carriers, said Roger Entner, an analyst with Recon Analytics LLC.

While factors such as the addition of Sprint as a carrier along with its unlimited plans has helped spark iPhone-mania, the iPhone model may have gotten an extra boost in sales from former Apple CEO Steve Jobs' recent passing on Oct. 5.

It's also possible customers are looking to obtain a piece of history, as the 4S is the last iPhone to be designed under Jobs as CEO. Others are likely just upgrading from expired contracts with the iPhone 3G.

In addition to popular iPhone demand, a comScore study recently found that iPads are demolishing the competition with 97.2 percent of U.S. tablet traffic in August 2011.

And Apple wants to keep that edge. Rumor has it that Apple will release an iPad mini with a price in the range of Amazon's popular tablet, the Kindle Fire, to counter its popularity and heavy sales. It is highly anticipated that it will be coming out this November at an almost irresistible price of $199, significantly cheaper than the iPad 2.

Related Article: Apple Releasing iPad Mini in Early 2012 to Compete with Amazon's Kindle Fire?