Radiation comes in many forms but to make it simple, we can divide radiation into two categories: ionizing and non-ionizing.

Ionizing radiation contains energy that can affect cells on the atomic level by removing an electron from an atom, or “ionizing” it. Ionizing radiation can damage the body’s DNA and cells.

Non-ionizing radiation can slightly move atoms in the human body, but sufficient research shows that it does not damage DNA or cells.

Radio frequency radiation (that comes from cell phones, Wi-Fi routers, Base station antennas and all our wireless devices) is non-ionizing. Moreover, every wireless device needs to pass Human Exposure certification.

For things like smartphones that work close to our bodies and use frequencies up to 6 GHz, there is a metric called Specific Absorption Rate (SAR). SAR shouldn't be more than 1.6 watts per kilogram and phones are tested to this specification.