The most dangerous manner of use is to place the phone against your head.
The best way to decrease your exposure to radiation is to use either the speakerphone or a safe headset when speaking on the phone, and to keep your phone as far away from your body as possible whenever it is on. You should never carry your phone in your shirt pocket or on your belt, for example.
San Francisco legislation now actually requires education about such cell phone risks at the point-of-sale. Educational materials must “inform customers of actions that can be taken by cell phone users to minimize exposure to radiation, such as turning off cell phones when not in use, using a headset or speaker phone and texting.” (Lines 15-17 of the final legislation.)
The Washington Post also reviewed a few products meant to minimize radiation exposure, such as a T-shirt and blanket that contain silver fibers to help block cell phone radiation, which are meant for use by pregnant women. There are also special cases on the market that contain pieces of gold designed to pull radiation away from your head and release it from the back of the phone.
These options may help cut back on your exposure, but the simplest way to really minimize your risk is to keep the phone as far away from your head and body as possible, as much as possible.
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