Since its official market debut in mid-October, the Apple iPhone 4S has sold in sizable numbers – at least 4 million units as of November 8. According to PC Magazine, analysts at Deutsche Bank recently discovered that demand for the device and related smartphones accessories appears to be steady and strong, with multiple Apple Store locations regularly selling out of their stock.

The news source reports that Deutsche Bank came to this conclusion after surveying online and physical retail outlets in the United States and abroad. At 90 percent of the 30 retail locations the firm questioned, the iPhone 4S sold out on a daily basis.

Additionally, demand is carrying over to new foreign markets, where  the device is being introduced for the first time, despite its price being comparatively higher than its U.S. total. For example, in Hong Kong, China, where the 4S recently became available for pre-order, it sold out within ten minutes.

Chris Whitmore, a Deutsche Bank analyst, expects Apple to sell a total of 28 million iPhones during the final quarter of 2011, and states that even that estimate might be "increasingly conservative," according to the news source.

The Associated Press reports that the product review magazine Consumer Reports recently released its opinion of the iPhone 4S, giving it a thumbs-up rating.