Best Buy has announced that it will be giving away free iPhone 4 Invisible Shields to any iPhone 4 user with a Reward Zone account showing that you bought the actual iPhone 4 at a Best Buy retail store. The official name for the shield they will be giving you will be the Zagg SideShield,  a invisible shield made to go around the iPhone 4, and for those of you who don’t know, the iPhone 4 has had reception issues when your hand touches the bottom left hand corner of the phone, where the cell phone antennae is located. So now there are 2 free options, you can either apply for a free bumper from Apple or you can get this new offer from Best Buy.