CarterLily Shockproof Dustproof Water Resistant Aluminum Armor Full-body Protection Case for iPhone 6 Plus / iPhone 6S Plus. Shockproof is one of our phone case's features. To better protect customers' iphones, We chose to use metal as the material for this phone case. But metal may affect the phone signal.Our large number of experiments show that the signal of the mobile phone will be reduced from 5 to 4. Actually, little effect.We hope oud customers know this problem before placing an order, and make decisions more cautiously.