China is Apple's second-largest and fastest-growing market

Cupertino, California-based Applehas been in talks about a tie-up with China Mobile for four years. A deal with China's biggest carrier is seen as crucial to improve Apple's distribution in a market of 290 million users - which is forecast to double this year.

China is Apple's second-largest and fastest-growing market - it brings in around 15 percent of total revenue - but the company's failure to strike a deal with China Mobile means it is missing out on a large number of phone users. As the China pie grows, Apple's sales increase, but without China Mobile, it's losing ground at a faster rate compared to other brands.

"In absolute terms, this (iPhone 5) launch will certainly result in strong sales for Apple in China. However, in relative terms, I don't believe it will move the needle enough in market share," said Shiv Putcha, a Mumbai-based analyst at Ovum, a global technology consultant.