Close icon Two crossed lines that form an 'X'. It indicates a way to close an interaction, or dismiss a notification. The iPhone 12. Apple says that the iPhone 12 and MagSafe accessories could interfere with implanted medical devices. Apple says to keep those items at least six inches away from a pacemaker or defibrillator. Doctors have also warned that the magnets could cause "suspension" of implanted devices. Apple is warning iPhone 12 users that the magnets in its magnetic accessories could interfere with implanted medical devices. In a new support document published last week, Apple provided more clarity on the issue, which the company, as well as medical professionals, have warned about since the new phones were released last October.