The paper describes the measurement of Wi-Fi devices radiation using smartphone. Wi-Fi devices are present both in public areas as well as in homes, therefore it is important to know their radiation. Measurements of the radiated levels included a few typical places indoors and outdoors where there was the largest possibility of exposure to the Wi-Fi radiation. The measured results showed that the obtained values were far below the current exposure limits of radiation of electromagnetic fields in the 2.4 GHz range.