ViewSonic intros dual-SIM V350 smartphone, Windows 7 / Android dual-boot ViewPad 10Pro tablet Mobile World Congress may not have its halls open quite yet, but that's not stopping ViewSonic from giving the world a peek at what's to come. First up is the V350 smartphone shown above, a dual-SIM creature with a 3.5-inch HVGA capacitive touchpanel, Android 2.2, five megapixel camera, a microSD card slo