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Cell phones and radiation: The 10 highest- and lowest-emitting models

Cell phone users -- a group that, these days, means practically everybody -- are no doubt concerned about Tuesday's news that the World Health Organization (WHO) classifies cell phones as "possibly carcinogenic to humans."

The phones themselves aren't necessarily harmful. It's the radiation emitted by the phones -- and absorbed by the human body -- that troubles some doctors.

But when it comes to radiation levels, all phones aren't equal. Below are lists of the models available from major carriers that emit the highest and lowest levels of radiofrequency energy.