American Heart Association Research Highlights: For some cardiac patients, a pacemaker or implantable cardioverter defibrillator is needed to help keep the heart beating normally. People who have an implanted cardiac device should not be near electronic devices that have magnets or produce electromagnetic waves because they can interfere with the cardiac device’s functions. Magnets in the iPhone 12® series, which allow the phones to be charged wirelessly, are stronger than the magnets found in earlier generations of iPhones. In a small study of different types of pacemakers and implantable cardioverter defibrillators, 11 of 14 cardiac devices experienced interference when an iPhone 12 Max Pro was held close to the cardiac device (within 1.5 cm), even when the device was still in the manufacturer’s sealed package.