Turning off your phone, or turning off Wi-Fi and Bluetooth when not in use can reduce EMF frequencies that are emitting from your phone. Keeping your cell phone away from your head when possible and distancing it from your body can reduce the amount of EMF frequencies that could otherwise affect vulnerable organs. DefenderShield EMF Blocking Cases and other EMF gear can form a physical shield that is scientifically engineered to block EMF frequencies. If you place the shield in between you and your cell phone or other mobile device, 99% of the frequencies hitting the shield will be blocked from direct skin contact with your body. Stickers, pendants, stones, and other forms of EMF protection have no scientific basis, and are not able to be measured by scientific instruments.