New features of the iPhone 4S include a faster A5 chip, an improved 8-megapixel camera, and a 1080p HD video camera. The iPhone 4S also contains both GSM and CDMA antennas, enabling the device to run on both U.S. and European networks.Following months of rumor and speculation, Apple also added Sprint (S) to its list of iPhone partners, significantly extending the reach of the iconic smartphone. In addition to its enhanced iPhone, Apple formally launched its iCloud service on Tuesday, along with iOS 5, which it is touting as the world's most advanced mobile operating system. Apple investors, however, were underwhelmed by the iPhone 4S news. The company's stock closed down $2.1, or 0.56%, at $372.50 on Tuesday. -- Written by James Rogers in New York. >To follow the writer on Twitter, go to http://twitter.com/jamesjrogers. >To submit a news tip, send an email to: firstname.lastname@example.org.