AT&T’s chief medical officer is warning that cellphones can easily spread the flu because they’re one of the few devices that regularly come in close contact with the face.

Dr. Geeta Nayyar is urging people to clean and disinfect their phones regularly, use hands-free headsets and avoid taking out their phones in restrooms.

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She says cellphones make a convenient delivery device for viruses because of how often people shake hands, turn doorknobs and use railings before touching their phone.

She is also recommending other basics for avoiding the flu: getting a flu shot, washing hands and avoiding anyone who is sick.