The IARC has concluded that cell phones are a "possible carcinogen" due to the amount of evidence going both directions.
The gist of it is summarised on the website itself:
Cell phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues closest to
where the phone is held.
The amount of ...
Exposure to ionizing radiation, such as from x-rays, is known to increase the risk of cancer. However, although many studies have examined the potential health effects of non-ionizing radiation from radar, microwave ovens, cell phones, and other sources, there is currently no consistent evidence that non-ionizing radiation increases cancer risk (1).
Cairo University's Journal of Advanced Research (PDF) looks at all of the studies on ElectroMagnetic Interferene (EMI) from mobile cellular phones and medical equipment.
It says that based on the literature, it was realized that during the initial development of cellular phones, the 2G cellular phones had caused more interference in the functioning of some ...
Phones can interfere with pacemakers, but usually the effects are rare and can be avoided.
Dr. Carsten Lennerz, study lead author and cardiology resident in the
Clinic for Heart and Circulatory Diseases at Munich’s German Heart
Centre, said that pacemakers in rare instances can mistakenly detect
electromagnetic interference from mobile phones. The ...