Apple boss Tim Cook has hinted it could lower iPhone prices in some places in an attempt to boost falling sales. Revenue from the iPhone, responsible for most of the firm's profits, fell 15% in its latest financial quarter. Overall the firm's revenue was down 5% from a year ago to about $84.3 billion. The slowdown had been expected after the tech giant warned investors earlier this month that revenue would be about $84 billion, lower than expected.