Although some studies reported an increased risk for malignancy associated with cell phones others did not, so we just don't know. It's important to bring knowledge to people in a way that is comprehensive and accurate and let them make the decisions about how they are going to use technology. Even if there is an association, it's not the end of the world because you can still use your cell phone -- just change the behavior by which you use them. Don't bring them close to your head, and use a headset or the speakerphone option -- anything that keeps the phone way from your head.
However parents should educate their children to avoid using cell phones close to their ears. Due to children's size, the amount of deposition of energy is higher than that in an adult. The Lancet paper discusses this.
It also has greater effects on the bone marrow of children. Another aspect that they don't discuss but which is relevant is that the brains of children and adolescents are undergoing very fast developmental changes. Their brains are much more neuroplastic and susceptible to changes triggered by environmental stimuli.
Basically we don't have sufficient knowledge to know how cell phone signals affect brain processes. Why not play it safe? How you modify your behavior depends in part how you handle uncertainty: We are bad at dealing with uncertainty in regard to potential effects to brain so we may chose to be conservative.
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