South Korea has started offering what are billed as the fastest ever 4G data speeds made available to consumers. SK Telecom says its LTE-Advanced network allows files to be downloaded at up to 150 megabits per second. That is twice as fast as before and 10 times the rate of its 3G service. Although in practice subscribers will get a slower rate, the firm says it will still be fast enough to start offering a full- HD 1080p video streaming service from early July. (BBC)