Updated:20% is today's daily digit - the fall in overall net sales at Nokia. An increase in sales of Lumia smartphones - up to 5.6 million units from 4.4m - was overshadowed by a big fall in basic phones. Sales at the equipment venture Nokia Siemens Networks also fell unexpectedly. As a result the Finnish mobile phone maker expects operating margins to fall by 2% in the second quarter - compared to plus 0.1% in the first. Nokia has fallen well behind Samsung and Apple in the smartphone race.