Volkswagen PASSAT 2013 Manual page 335

WARNING
Using a mobile phone or CB radio inside the vehicle without a properly installed and separate
outside antenna can be dangerous to your health and that of your passengers because the
electromagnetic radiation energy that cell phones and CB radios emit may be above
established limits. This also applies if the outside antenna is not installed properly.
Always keep the mobile phone antenna at least 8 in (20 cm) away from pacemakers. Heart
specialists advise that cell phones can adversely affect the way pacemakers work.
Never carry a mobile phone that is switched on in the breast pocket directly over a
pacemaker.
If you suspect there may be interference with a pacemaker or other medical device, switch
the mobile phone off immediately.