It was just weeks ago that BLU Products' smartphones were largely dual-core models like the Vivo 4.65 HD. The company clearly wants to ramp things up, as it's kicking off the Quattro line based around Android 4.0 and the quad-core, 1.5GHz Tegra 3. At the entry level is the $250 Quattro 4.5, which includes a qHD display at its namesake size as well as a 5-megapixel camera, 4GB of built-in storage and a microSD slot. The next step is, unusually, the biggest: the $300 Quattro 5.7 HD (what you see above)
