Tech Henry Ford docs spot potentially fatal iPhone 12 problem with pacemakers, defibrillators February 4, 2021 Kristen Jordan Shamus, Detroit Free Press Comments Off on Henry Ford docs spot potentially fatal iPhone 12 problem with pacemakers, defibrillators Magnets in the iPhone 12 can disable pacemakers and implanted defibrillators, Henry Ford doctors found. They prompted Apple to issue a warning.