SAR is a measure of the amount of radio frequency energy absorbed by the body when using a mobile phone.The FCC requires cell phone manufacturers to ensure that their phones comply with these objective limits for safe exposure. Any cell phone at or below these SAR levels (that is, any phone legally sold in the U.S.) is a "safe" phone, as measured by these standards. The FCC limit for public exposure from cellular telephones is an SAR level of 1.6 watts per kilogram (1.6 W/kg).
Although the SAR is determined at the highest certified power level, the actual SAR level of the device while operating can be well below the maximum value. This is because GSM phones are designed to operate at multiple power levels so as to use only the power required to reach the network. In general, the closer you are to a wireless base station antenna, the lower the power output of the device and vice versa. Keep in mind that it is possible for the SAR level to vary between different transmission bands (the same phone can use multiple bands during a call), and that different testing bodies can obtain different results. Also, it's possible for results to vary between different models of the same phone--as in the case of a handset that's offered by multiple carriers.
If you're concerned about limiting your SAR exposure, you can take a few easy steps. You can text instead placing a voice call, use a speakerphone or headset whenever possible, and carry your phone at least 1 inch from your body (making sure the antenna is facing away from you). If you're pregnant, you should avoid carrying a phone next to your abdomen. Some researchers also caution against using your phone in areas with a weak signal since phones emit more electro-magnetic radiation during those times. Children, who have smaller and thinner skulls, should limit cell phone use, and people of any age should not sleep with an active phone next to the bedside or under the pillow.
Buying a phone with a lower SAR may make you feel more comfortable, but there's no guarantee that it is inherently safer.
Also, during a call the phone may never reach the listed SAR and the SAR can change constantly depending on several factors.
US:1.6 W/kg
Europe:2 W/kg
Canada:1.6 W/kg
Although the SAR is determined at the highest certified power level, the actual SAR level of the device while operating can be well below the maximum value. This is because GSM phones are designed to operate at multiple power levels so as to use only the power required to reach the network. In general, the closer you are to a wireless base station antenna, the lower the power output of the device and vice versa. Keep in mind that it is possible for the SAR level to vary between different transmission bands (the same phone can use multiple bands during a call), and that different testing bodies can obtain different results. Also, it's possible for results to vary between different models of the same phone--as in the case of a handset that's offered by multiple carriers.
If you're concerned about limiting your SAR exposure, you can take a few easy steps. You can text instead placing a voice call, use a speakerphone or headset whenever possible, and carry your phone at least 1 inch from your body (making sure the antenna is facing away from you). If you're pregnant, you should avoid carrying a phone next to your abdomen. Some researchers also caution against using your phone in areas with a weak signal since phones emit more electro-magnetic radiation during those times. Children, who have smaller and thinner skulls, should limit cell phone use, and people of any age should not sleep with an active phone next to the bedside or under the pillow.
Buying a phone with a lower SAR may make you feel more comfortable, but there's no guarantee that it is inherently safer.
Also, during a call the phone may never reach the listed SAR and the SAR can change constantly depending on several factors.
US:1.6 W/kg
Europe:2 W/kg
Canada:1.6 W/kg
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