The move is an attempt to stem weak sales of the iPhone, particularly in overseas markets such as China, where a 10 percent rise in the U.S. dollar over the past year or so has made Apple’s products – which already compete at the top end of the market – much pricier than rivals. Apple Chief Executive Tim Cook disclosed the plan on Tuesday after the company reported the first-ever dip in iPhone sales during the key holiday shopping period. The company has only once before cut iPhone prices, shortly after it debuted in 2007.