It's not proven that cell phones cause cancer. Actually, science says that cell phones shouldn't cause cancer. Why though...?
http://en.wikipedia.org/wiki/Cell_phone#Controversy
<div class='quotetop'></div><div class='quotemain'>It is generally thought, however, that RF is incapable of producing any more than heating effects, as it is considered non-ionizing radiation; in other words, it lacks the energy to disrupt molecular bonds such as occurs in genetic mutations.</div>
http://en.wikipedia.org/wiki/Cell_phone#Controversy
<div class='quotetop'></div><div class='quotemain'>It is generally thought, however, that RF is incapable of producing any more than heating effects, as it is considered non-ionizing radiation; in other words, it lacks the energy to disrupt molecular bonds such as occurs in genetic mutations.</div>