The human biofield, which is electro-magnetic by nature, is negatively impacted by cell phone frequencies. Shungite emits a field which is beneficial to biological systems. It is used by the Russian scientific community to help mitigate harmful radiations.
Attach a shungite disc or rectangle to the outside of your cell phone to help reduce heat. Shungite is reputed to reduce the impact of harmful electro-magnetic frequencies generated by your cell phone.