THURSDAY, March 24 (HealthDay News) -- 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 in a belt pouch on their right hip for at least one year and 24 men who did not use cellphones. Mineral content and density are standard markers of bone strength.