Product Review: Sony-Ericsson Z500a Smartphone (NewsFactor) NewsFactor - Measuring 3.6 x 1.9 x .9 inches and weighing in at 110 grams, the new Sony Ericsson Z500a smartphone from Cingular Wireless enables road warriors to add a variety of highly effective tools to their mobile arsenals. Included are high-speed access to e-mail and the Internet, as well as a push-to-talk capability for instantly contacting fellow workers.