TOPSHOTS Apple chief executive Tim Cook praises the new iPhone 5S as the most refined model the company has ever introduced on September 10, 2013 in Cupertino, California. Apple unveiled two new iPhones on Tuesday in its bid to expand its share of the smartphone market, including one as low as $99 with a US carrier contract. "The business has become so large that this year we are going to replace the iPhone 5 and we are going to replace it with two new designs," Apple chief Tim Cook announced at the company's Silicon Valley headquarters. Apple will begin taking orders on Friday, and on September 20 the two devices will go on sale in the United States, Australia, Britain, China, France, Germany, Japan and Singapore. AFP PHOTO/GLENN CHAPMANGLENN CHAPMAN/AFP/Getty Images