Avoiding radio frequency interference

This article has been archived and is no longer updated by Apple.

Nearly every electronic device is subject to radio frequency (RF) interference from external sources if inadequately shielded, designed, or otherwise configured to be compatible. As a result, iPhone may cause interference with other devices. Follow these instructions to avoid interference problems.

  • Aircraft
    Federal Aviation Administration (FAA) regulations may prohibit using wireless devices while in the air. For more information about using Airplane mode to turn off the iPhone wireless transmitters, see the iPhone User's Guide.
  • Vehicles
    Radio frequency signals may affect installed or inadequately shielded electronic systems in motor vehicles. Check with the manufacturer or its representative regarding your vehicle.
  • Electronics Devices
    Most modern electronic equipment is shielded from RF signals. However, certain electronic equipment may not be shielded against the RF signals from the iPhone.
  • Pacemakers
    The Health Industry Manufacturers Association recommends that a minimum separation of 6 inches (15 cm) be maintained between a handheld wireless phone and a pacemaker to avoid potential interference with the pacemaker. Persons with pacemakers:
    • Should always keep iPhone more than six inches from their pacemaker when the phone is turned on
    • Should not carry iPhone in a breast pocket
    • Should use the ear opposite the pacemaker to minimize the potential for interference

    If you have any reason to suspect that interference is taking place, turn iPhone off immediately.

  • Hearing Aids
    The iPhone may interfere with some hearing aids. If it does, consult the hearing aid manufacturer or your physician for alternatives or remedies.
  • Other Medical Devices
    If you use any other personal medical device, consult the manufacturer of your device or your physician to determine if it is adequately shielded from external RF energy.

    Turn the iPhone off in health care facilities when any regulations posted in these areas instruct you to do so. Hospitals and health care facilities may use equipment that is sensitive to external RF energy.
  • Posted Facilities
    Turn off the iPhone in any facility where posted notices so require.
  • Blasting Areas
    To avoid interfering with blasting operations, turn off iPhone when in a "blasting area" or in areas posted "Turn off two-way radio." Obey all signs and instructions.

FCC Compliance Statement

This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions:
  1. This device may not cause harmful interference, and
  2. this device must accept any interference received, including interference that may cause undesired operation.

Important: Changes or modifications to this product not authorized by Apple could void the EMC compliance and negate your authority to operate the product. This product has demonstrated EMC compliance under conditions that included the use of compliant peripheral devices and shielded cables between system components. It is important that you use compliant peripheral devices and shielded cables between system components to reduce the possibility of causing interference to radios, televisions, and other electronic devices.

Published Date: Feb 20, 2012