Apple iPhone 4 User Manual

Page 6

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Airplane mode is on, you cannot make or receive calls or use features that
require wireless communication. Under some conditions, certain accessories
may affect iPhone wireless performance. Reorienting or relocating iPhone
and the connected accessory may improve wireless performance.
Keeping iPhone Within Acceptable Temperatures iPhone is designed
to be operated in temperatures between 0º and 35º C (32º to 95º F) and
stored in temperatures between -20º and 45º C (-4º to 113º F). Low- or
high-temperature conditions might temporarily shorten battery life or
cause iPhone to temporarily stop working properly. Leaving iPhone in
a parked vehicle or in direct sunlight can cause iPhone to exceed these
storage or operating temperature ranges. Avoid dramatic changes in
temperature or humidity when using iPhone as condensation may form
on or within iPhone.
When you’re using iPhone or charging the battery, it is normal for iPhone
to get warm. The exterior of iPhone functions as a cooling surface that
transfers heat from inside the unit to the cooler air outside.
Exposure to Radio Frequency Energy iPhone transmits and receives
radio frequency (RF) energy through its antennas. The iPhone cellular
antenna is located at the bottom edge of iPhone, to the left of the Home
button. The Wi-Fi and Bluetooth® antenna is located at the top edge of
iPhone, to the right of the headset jack.
iPhone is designed, tested, and manufactured to comply with the limits
for exposure to RF energy set by international regulatory agencies,
including the FCC of the United States, IC of Canada, MIC of Japan, and
the Counsel of the European Union, among others.
“Specific Absorption Rate,” or SAR, refers to the rate at which the body
absorbs RF energy. The SAR limits for mobile phones are 1.6 watts per
kilogram (W/kg) for the FCC and IC, and 2.0 W/kg for the Council of the
European Union.
iPhone has been tested,

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and meets the FCC, IC, and European Union RF

exposure guidelines for cellular, Wi-Fi, and Bluetooth operation.
During SAR testing, iPhone is held in standard operating positions (i.e.,
at the head and on the body) and its radios are set to transmit at the
highest power level. iPhone’s maximum SAR levels on each frequency of
operation are provided in a chart at the end of this section.
The SAR levels experienced during normal use may be lower than the
maximum SAR levels. In normal use, iPhone automatically adjusts radio
transmission power to the lowest level necessary to communicate with
the wireless network.
When carrying iPhone, keep it 1.5 cm (5/8 inch) or more away from your
body to ensure exposure levels remain at or below the maximum levels.
Avoid cases with metal parts.

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The device was tested according to measurement standards and

procedures specified in FCC OET Bulletin 65, Supplement C (Edition
01-01) and IEEE 1528-2003, and Canada RSS 102, Issue 4, March 2010.
iPhone adheres to the European Council Recommendation of 12
July 1999 on the Limitation of Exposure of the General Public to
Electromagnetic Fields [1999/519/EC].

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