A British climber has set a world record by making a mobile phone call from the top of Mount Everest.In the early hours of 21 May, Rod Baber made two calls from the mountain’s north ridge. In the first call Mr Baber described the view, how cold it was and what he wanted to do when back at base camp; he then rang his wife and children. The calls were made possible when China set up a mobile base station with a line of sight to the north ridge. Mr Baber set off from the UK for the Himalayas on 30 March and since mid-April has been getting used to living at high altitude.