An attendee uses the touchscreen of a Vibe X smartphone device, manufactured by Lenovo Group Ltd., at the IFA consumer electronics show in Berlin, Germany, on Friday, Sept. 6, 2013. Global smartphone revenue will rise 22 percent in 2013, or nearly half the pace of an expected 41 percent gain in shipments, amid falling prices, according to UBS. Photographer: Krisztian Bocsi/Bloomberg via Getty Images