• iPhone 6S (L) and iPhone 6S Plus (R)

iPhone 6S (L) and iPhone 6S Plus (R) (Photo : YouTube)

Apple Inc. announced on September 14, Monday that worldwide pre-order figures for its iPhone 6S and iPhone 6S Plus smartphones were on pace to pass last year's record of 10 million mobile devices sold during the first weekend. An Apple spokeswoman revealed that online demand was higher than the company's forecasts, and that the new models would be on sale at the tech company's retail stores next week.

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Pre-orders for the new iPhones started over the weekend, and the tech giant is working overtime so the handsets' supply catches up with their demand. They will hit Apple stores on Sep. 15.

The new iPhone 6S and big-screen iPhone 6S Plus were unveiled last week at Apple's September event in San Francisco. Investors have high hopes for the new devices.

Walter Piecyk is a BTIG analyst. He stated that the 2015 sales figures also include China, doubling the launch day market size compared to last year's October release in the country, according to The New York Times. Thus, this year's higher numbers have an X-factor.

The iPhone inventory blog showed that the wait time in China is two to three weeks for the iPhone 6S. It is three to four weeks for the 6S Plus.

However, Amit Daryanani of RBC Capital Markets explained that it is unclear if the back-order data is for actual purchase orders or soft promises to buy the new Apple smartphones after they are available, according to CNBC. That is the big question.

Following Apple's iPhone sales figures announcement, its stock price opened higher.

The iPhone 6 and iPhone 6 Plus were launched in September 2015. In the fourth quarter of 2014 Apple posted an $18 billion profit, setting a United States record as the most profitable quarter for any publically-traded business.

This video is a parody first look of the iPhone 6S: