Actually, that is an urban myth that you are helping to propagate.   No such credible studies exist.  

The American Cancer Society has an excellent web page that debunks all of this nonsense about cellular phone towers posing any health risks.   Take a look:

http://www.cancer.org/cancer/cancercauses/othercarcinogens/athome/cellular-phone-towers

Please learn the true facts, and stop spreading such unfounded fears.