I don't know if people here are (made) aware of this, but whenever you make/receive a phone call, in an area where you see less bars in the signal strength indicator, then the antenna signal level (power) will have to be adjusted – by the firmware – to avoid dropped calls. That is also when we are exposed to a higher Specific Absorption Rate (SAR) because the output has to be so much higher.
Want to read the lab reports of your iPhone 4, then
Start here or jump right in with
this document.
And here are the permissible amounts of radiation:
- Head: up to 1.6 W/kg
- Whole body: up to 0.08 W/kg
- Hands, wrists, feet, and ankles: up to 4 W/kg
Notes: Generally a margin of safety is between 50 and 100 times lower than the point at which health problems might occur, but for cell phone radiation exposures to the head, the standard for cell phones allows a SAR value up to 1.6 W/kg – a margin of safety of only 2.5 times!
And for exposures to hands, wrists, feet and ankles, cell phones can legally have a SAR value of 4 W/kg – no margin of safety!
But more importantly; The FCC regulation has never been updated, not since 1992!
Tip: People making many/long phone calls should use a Blue tooth headset, which also exposes you to radiation, but to a much, much lower (acceptable) level.
