A small study out of Argentina suggests that cellphone users might be at heightened risk for a weakening of bone in the hip area. Researchers measured bone mineral content and bone mineral density in the left and right hips of 24 men who carried their cellphones on their right hip for at least one year, and 24 men who did not use cellphones. The men who carried cellphones on their right hip had lower mineral content in the area near the top of the thigh bone.