Final answer:
Cell phones use electromagnetic waves to communicate, but the claim that they lead to brain cancer is not supported by science.
Step-by-step explanation:
The claim that cell phone use leads to brain cancer is not supported by science. The electromagnetic waves used by cell phones, such as radio waves, do not increase or decrease matter. They transport digitized voice or data in the form of oscillating electric and magnetic fields, called the electromagnetic field (EMF). The concern about cell phone radiation and its potential health hazards has been studied extensively, and while some studies have found a link between cell phone use and brain cancer, the evidence is still inconclusive and tenuous at best.