So, they’ve found some measurable effects on the brain of using a cell phone next to the head, but there’s no evidence of harm, apparently:

Exposure to the electromagnetic fields emitted by cell phones excites the brain in a small but measurable way, reveals a new study published in the Annals of Neurology.

The researchers

found that cell phone exposure increased cortical brain activity on the left side, where the phone was activated.

In this study, the researchers measured how “ready” a subject’s brain was to move his or her thumb.

At this point, scientists cannot say if this increased activity is good or bad. The results are too preliminary.