Proporta has introduced its new Antimicrobial Silicone Case with SteriTouch for the iPhone 3G and iPhone 3GS. The Antimicrobial Silicone Case is made from rugged silicone, which has been treated with an antimicrobial coating to guard against germs and bacteria, and features a textured black outer surface with grey interior. Proporta’s Antimicrobial Silicone Case with SteriTouch for the iPhone 3G and iPhone 3GS is available now and sells for…