How should consumers use this information?
Also see: "Do iPhones emit more radiation than
Samsung Galaxy phones?"
- When communication is unnecessary, use Airplane mode.
- When using cellular, turn off Wi-Fi and Bluetooth.
- When using Wi-Fi, turn off cellular and Bluetooth.
- When phone is powered on, never keep phone next to your body, especially during a phone call.
- When communicating, use phone in speaker mode or a wired earpiece.
For information about wireless head sets, see my AirPods post.A word of warning about new iPhones: Sophos has an article on its computer security website entitled, "iPhone's new 'off' switch that leaves Bluetooth and Wi-Fi turned on." (Please let me me know if this information is false.)
The SAR for the iPhone X Model A1901 (BCG-E3175A [no CDMA]) for cellular transmission is 1.07 watts per kilogram (w/kg) at the head, and 1.09 w/kg when worn on the body. The hotspot/Airplay SAR is 1.09 w/kg. The SAR for simultaneous transmission (cellular plus Wi-Fi) is 1.41 w/kg at the head, 1.59 w/kg when worn on the body, and 1.59 w/kg when used as a hotspot.
All SARs reported above are averaged over one gram of body tissue corresponding to the US guidelines. The SAR values vary by cell phone carrier: Verizon and Sprint use the CDMA models, and AT&T and T-Mobile use the GSM models.
The SAR values listed above are for conventional cell phone communications using spectrum licensed to cell phone carriers (i.e., PCE). Apple lists slightly higher values on its website for the head and body which represent cell phone communications using unlicensed spectrum (i.e., NII). Note that Apple does not report on its website the SARs in hotspot mode or for simultaneous transmission of cellular and Wi-Fi.
What do SAR values mean to the consumer?
For tips on how to reduce exposure to wireless radiation, see "Some Tips to Reduce Your Exposure to Wireless Radiation". (18) In short, limit your use of the phone, keep the phone away from your body whenever it is powered on, use the phone hands-free, and turn off transmitters not in use (e.g., shut off Wi-Fi or use airplane mode).
(3) FCC. Specific Absorption Rate (SAR) for Cellular Telephones. Undated. http://www.fcc.gov/encyclopedia/specific-absorption-rate-sar-cellular-telephones
(7) Environmental Working Group. EWG’s Guide to Safer Cell Phone Use: Where is EWG's cell phone database? August 27 2013.
(17) Joel Moskowitz. Brain Tumor Rates are Increasing in the U.S.: The Role of Cell Phone and Cordless Phone Use. http://bit.ly/risingtumors
(18) Joel Moskowitz. Some Tips to Reduce Your Exposure to Wireless Radiation (one page handout). Undated. http://bit.ly/saferemrtips3