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Typical frequencies for devices generating radio frequency fields

Radio frequency fields 100 kHz to 300 GHz
Radio transmitters operated in the long wave range 30 kHz to 300 kHz
Welding devices up to a few hundred kHz
Electrosurgery systems some hundred kHz
clinical MRI devices use radio frequency fields in addition to static and intermediate frequency fields 63 MHz
Mobile telephony: GSM 900 about 900 MHz
Mobile telephony: GSM 1800 about 1800 MHz
Mobile telephony: UMTS 2100 about 2100 MHz
anti-theft devices Ranging from some tens of Hz to a few GHz depending on the type of system

Source: SCENIHR  Possible effects of Electromagnetic Fields (EMF) on Human Health