Magnetic fields of a certain strength can interfere with pacemakers and defibrillators. Anyone who has an implanted medical device should therefore not carry a smartphone directly above their chest – in their shirt pocket, for example. Apple advises customers with an implanted pacemaker, for example, to keep a minimum distance of 15 centimetres to several of its devices, including tablets, laptops, smartwatches and wireless headphones, as well as the iPhone 12 and 13, which use magnetic technology for charging. The latest iPhone models have a circular array of 18 individual magnets (called Mag…