There have already been links between cell phone use and brain cancer. The microwave radiation that is emitted from cell phones can affect a child's brain worse than an adult because younger skulls are thinner and less protective. The worse effects come from long term and frequent use of using wireless phones. Radiation levels vary by phone and wireless phones are assigned a number called the Specific Absorption Rate (SAR). It is recommended to choose a cell phone with a lower SAR rating.
The risks of tumor growth and damage decreases as a wireless phone is moved farther from the face. It is recommended that anyone using a wireless phone should use a headset or a wireless Bluetooth device.