A) an increased risk of car accidents.
lThe risk of a collision was about four times greater when the driver was using either a hand-free telephone or holding the phone to the ear with one hand.
lThe heaviest users have more than twice the mortality rates from car accidents than the lightest users.
B) Use of hand-held cellular phones involves placing a small transmitter which emits radio frequency radiation (microwave radiation) next to the head.
l some of the studies indicate that the microwaves emitted by the cell phones doubled the cancer cells in mice.
C) mobile phones affects brain activity.
Because the head and nervous system are still developing into the teenage years, the expert group considered that if there are any unrecognized health risks from mobile phone use, then children and young people might be more vulnerable than adults. Living tissue is vulnerable to electromagnetic fields within the frequency bands used by cell phones (from 800 to 2200 MHz), notably an increase in the permeability of the blood-brain barrier and an increased synthesis of stress proteins. 
There has also been some connection between electromagnetic fields and an increased number of seizures in people with epilepsy.
D) There are cases where people feel their skin got heated up when using the cell phone. Cell phone emits electromagnetic radiation. A high amount of high frequency radiation can make our body heat up.
E) Pacemaker device is a sensitive device. Radiation emitted by cell phone is big enough to cause interference to pacemaker device.
F) Using hand phone may effect of human fertility. Radiation from hand phone can affect us if we are exposed to them constantly. For women, It is being said that cell phone usage causes sterility in women and might be the reason for birth defects and damaging the growth of embryos.(Ilori,2008). While for men, longer exposure with electromagnetic radiation emitted from cell phone resulted in larger percentage of slower sperm. The 2008 study titled “Effect of Cell Phone Usage on Semen Analysis in Men attending Infertility Clinic” concluded that the use of cell phones by men associated with a decrease in semen quality.
G) high exposure rate to hand phone on your ear constantly can affect hearing
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