Apple iPhone 4S

The iPhone 4S design is nearly unchanged from the iPhone 4, however, due to the greatly improved hardware and software functions, it has attracted many customers. Its screen has remained at 3.5 inches since the first edition appeared in 2007, although a larger display is expected in the next iPhone version to be released later this year.

The handset is equipped with Apple's new A5 processor, which is the first smartphone to use a dual-core processor and dual-core display chip, 7 times faster than before. The latest iOS 5 operation system has updates and improvements in over 200 functions. The iCloud service allows the users to save their information on the server side and can access it through all their iOS 5 devices.

The 8-megapixel camera offers autofocus, flash, a f/2.4 aperture lens, and a backside-illuminated CMOS sensor that allows 73 percent more light than the previous sensor and should deliver better low-light performance. The camera has better auto white balance and claims to be 33 percent faster than the iPhone 4's camera. Videos also get a boost with the ability to shoot 1080p HD video clips at 30 frames per second and with video stabilization.

The feature that Apple is touting most for iPhone4S is the new voice assistant Siri, which allows users to operate the phone by voice control. The phone supports both GSM and CDMA networks, and can roam worldwide.

The handset is available in four storage versions: 16GB, 32GB and 64GB. The price is 4,988 yuan (US$791.7) in China for the 16GB version.