The results of a new study by the National Toxicology Program—the largest and most expensive study of its kind—show a link between cell phone radiation and cancer in rats.

For many people, these findings likely raise questions and concerns about the safety of devices that we now carry with us nearly all the time.

Consumer Reports health and safety experts, who have long been concerned about the potential risks of cell phones and urged precautions when using them, say the new study supports that caution.

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