Mayo Clinic lists heavy cell phone use as possible risk factor for acoustic neuroma

In 2011 the Mayo Clinic said on its webpage; 

Other possible but unconfirmed risk factors for acoustic neuroma include:

• Exposure to loud noise
• Childhood exposure to low-dose radiation of the head and neck
• History of parathyroid adenoma, a benign tumor of the parathyroid glands in the neck
• Heavy use of cellular telephones