A mobile phone is essentially a small low powered radio transmitter and receiver which connects to a mobile network to enable telephone calls.

Mobile phones use radio frequency (RF) fields to send and receive calls, texts, emails, pictures, web, TV and downloads. An RF signal is sent to the nearest base station, which sends the signal to a digital telephone exchange and on to the main telephone network. This connects the signal to the receiving phone, again via a base station (if it is another mobile phone).

Radio frequency exposure limits for mobile phones and wireless devices are well established, and are based on decades of research into possible health effects.

The World Health Organization monitors scientific research on mobile phone safety and concludes:

"A large number of studies have been performed over the last two decades to assess whether mobile phones pose a potential health risk. To date, no adverse health effects have been established as being caused by mobile phone use." 

WHO Fact Sheet 193 June 2014 - Electromagnetic fields and public health: mobile phones

The WHO also provides information on how to effectively reduce mobile phone exposure:

“In addition to using "hands-free" devices, which keep mobile phones away from the head and body during phone calls, exposure is also reduced by limiting the number and length of calls. Using the phone in areas of good reception also decreases exposure as it allows the phone to transmit at reduced power. The use of commercial devices for reducing radiofrequency field exposure has not been shown to be effective.”

WHO Fact Sheet 193 June 2014 - Electromagnetic fields and public health: mobile phones

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