Foursquare predicts that the sales numbers of the latest iPhone 6s and iPhone 6s Plus will be between 13 million and 15 million globally during the launch weekend.

Apple unveiled its new smartphones, the iPhone 6s and iPhone 6s Plus, on Sept. 9 and the handsets will start shipping from Sept. 25 onward. The demand for new iPhones is immense, but Foursquare believes that the deliveries of preordered phones may also get affected.

The 2014 launch weekend sales for the iPhone 6 and iPhone 6 Plus reached 10 million. If Foursquare's prediction comes true, then the launch weekend sales this year for the new iPhones will be about 30 to 50 percent higher when compared to last year's.

"That shows a level of enthusiasm that promises a better first weekend than we've seen in the past," said Foursquare COO Jeff Glueck.

Glueck also added that iPhone purchases between Friday, Sept. 25, and Sunday, Sept. 27 will rise by 360 percent in comparison to the sales recorded in the past 12 weeks.

Market analysts also suggest that iPhone sales in the quarter ending December this year may reach up to 77 million globally. The same quarter of 2014 witnessed a global sale of 74.5 million units.

In 2014, Apple released its first plus size phone, the iPhone 6 Plus with a 5.5-inch display, which is believed to have driven sales. The iPhone 6s and iPhone 6s Plus include new features such as a new aluminum body, improved camera capabilities and sensors, 3D Touch, and the new Rose Gold color option, which Apple is expecting to spike sales even further this year.

Daniel Ives, an analyst with FBR & Co. says that new carrier plans in the U.S. offering yearly upgrades may trigger increased sales of the iPhones this launch weekend.

Apple's flagship store in San Francisco's Market Street sold the maximum number of iPhones during the 2014 launch weekend, followed by the Fifth Avenue store in New York.

However, some market observers believe that Pope Francis' visit to New York is expected to delay deliveries of the iPhone 6s and iPhone 6s Plus in some New York stores.

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