UK operators demand GCHQ answers; Apple, Samsung still top semiconductor buyers

> UK mobile operators are demanding intelligence agency GCHQ reveal if it has circumvented data privacy laws by analysing UK SMS metadata in the US. Article

> Apple and Samsung Electronics remained the top semiconductor buyers in 2013, Gartner said, purchasing a combined $53.7 billion (€39.2 billion) worth of semiconductors in 2013. Release

> Activist investor Carl Icahn reiterated a call for Apple management to ramp its share buyback programme, after revealing he has increased his investment in the device maker to over $3 billion. Article

> The GSM Association warned UK LTE rollouts may be stymied by plans to hike the price of spectrum by up to four times. Article

> Telenor said it could take another five years for reliable broadband connections to reach the northern Arctic. Article

And finally…Using a smartphone late at night has a similar effect on employees' performance the next day as a hangover, according to research by a business academic at Michigan State University. Article