Griffin Technology has unveiled its FlexGrip case for the iPhone 3G. The FlexGrip is a form-fitting silicone case featuring textured surfaces on its side and back for added grip. It offers full access to the iPhone’s screen, sensors, ports, and controls, and includes a screen protector. The Griffin FlexGrip for iPhone 3G will come in a variety of colors, and will sell for $15. According to the company, it will be available “in plenty of time for the official availability of iPhone 3G.”