Using earphones during a phone call can reduce radiation exposure by ten

Alexander Schmid

January 23, 2022 at 4:50 p.m.


google pixle 4a headphones © Gabriel Manceau

© Gabriel Manceau

You can stop checking the SAR of a smart phone
before a purchase, this is not relevant if you use a hands-free kit.

The National Frequency Agency (ANFR) has published its report on the use of headsets (or hands-free) as part of a study on public exposure to electromagnetic waves.

No impact of 5G on SAR

The conclusion of the research is clear: the maximum measured exposure to waves is ten times lower by telephoning with headphones equipped with a microphone than by sticking your smartphone against your ear.

The ANFR explains that it carried out a series of 920 Specific Absorption Rate (SAR) tests with six headset kits to arrive at this result. Several models of smartphones were also used, and the communications were passed on different bands of technologies: 2G, 3G and 4G.

No measurement was made in 5G, but a previous ANFR study concluded that 5G did not increase exposure to waves compared to 4G.

Wired or Bluetooth headphones, proven effectiveness

According to the report, wired headphones are the best solution to avoid high SAR, whether in the head or limbs. This is due to the waves produced by Bluetooth technology. But with or without wires, the use of headphones drastically reduces exposure to waves and the SARs measured are much lower than those recommended by French regulations.

The measurements recorded were in so-called ” worst case », that is to say when the quality of the network is poor, leading to an explosion in the emission of waves.

DAS headphones © ANFR


The ANFR indicates that to limit the SAR, the most relevant criteria are the use of a hands-free kit and phoning on a high-performance network. So, the SAR indicated on the technical sheet of smartphones is almost anecdotal, even irrelevant and misleading.

Source: ANFR

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