(Telecompaper) ZTE announced at the Mobile World Congress in Barcelona that it expects to increase smartphone revenues by 30 percent in 2013, helping to maintain its position as a top-four global handset manufacturer. The Chinese company aims to be a top-three handset manufacturer by 2015. ZTE's smartphone sales doubled last year, and smartphones accounted for 70 percent of its total handset revenues. In 2013 ZTE plans to target the high-end market, build its brand, further enhance hardware and software design capabilities, and rapidly build new routes to market through multiple channels. The company will launch four websites this year to further develop its consumer presence - www.ztedevices.com for the global market, www.ztedevices.com.cn for China, www.ztedevices.com/us for the US and www.ztedevices.com/uk for the UK. Over the next 2-3 years, ZTE expects to develop websites in a further 30 strategic countries around the world to provide product information and support, with all sites optimised for mobile device access.