While many people may start to relax when they get a 'Friday Feeling' at the end of the working week, it's the busiest time for mobile phone networks. New research from Orange has revealed that the top time for Brits to chat is 4.30pm on a Friday. A survey of the Orange UK network in October revealed that nearly six million people are on the phone at 4.30pm on Fridays. Conversely, Sundays are particularly quiet – and the quietest weekday is a Tuesday.