Newer models of smartphones, such as the iPhone 12, can interfere with the operation of ICDs if the phone is placed in close proximity to the device or over the device.
For your safety and to ensure that the device operates correctly, always remember to keep your phone at least six inches from your device. For more information please refer to your device manufacturer and the following YouTube video from Doug Rachac.
Follow Doug Rachac on YouTube for regular device updates: https://www.youtube.com/user/flamtap92