Apple iPhone 4 - Manual (Page 4)

Avoiding Hearing Damage Permanent hearing loss may occur if the
receiver, earbuds, headphones, speakerphone, or earpiece are used
at high volume. Use only compatible receivers, earbuds, headphones,
speakerphones, or earpieces with your device. Turn on the audio and
check the volume before inserting anything in your ear. You can adapt
over time to a higher volume of sound that may sound normal but can
be damaging to your hearing. If you experience ringing in your ears
or muffled speech, stop listening and have your hearing checked. The
louder the volume, the less time is required before your hearing could be
affected. Hearing experts suggest that to protect your hearing:
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Limit the amount of time you use the receiver, earbuds, headphones,
speakerphone, or earpieces at high volume.
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Avoid turning up the volume to block out noisy surroundings.
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Turn the volume down if you can’t hear people speaking near you.
For information about how to set a maximum volume limit on iPhone,
see the iPhone User Guide.
Emergency Calls You should not rely on wireless devices for essential
communications, such as medical emergencies. Use of iPhone to call
emergency services may not work in all locations or all operating
conditions. Emergency numbers and services vary by region, and
sometimes an emergency call cannot be placed due to network
availability or environmental interference. Some cellular networks may
not accept an emergency call from iPhone if iPhone is not activated, if
iPhone is not compatible with or configured to operate on a particular
cellular network, or (when applicable) if iPhone does not have a SIM or if
the SIM is PIN-locked.
Driving and Riding Safely Use of iPhone while driving a vehicle or
riding a bicycle may be distracting. If you find using iPhone disruptive
or distracting while driving or riding, pull off the road and park before
making or answering a call. Use of iPhone alone or with headphones
(even if used only in one ear) while driving or riding is not recommended
and is illegal in some areas. Consider using a compatible hands-free
device with iPhone. Use of a hands-free device may be required in some
areas. Check and obey the laws and regulations regarding the use of
mobile devices like iPhone in the areas where you drive or ride.
Navigating Safely Do not rely on iPhone applications that provide
maps, digital compass headings, orientation information, traffic
information, directions, or location-based navigation to determine
precise locations, proximity, orientation, distance, traffic conditions or
direction. These applications should only be used for basic navigation
assistance.
Maps, directions, and location-based applications depend on data
services. These data services are subject to change and may not be
available in all areas, resulting in maps, digital compass headings,
directions, traffic conditions or location-based information that may be
unavailable, inaccurate, or incomplete.
iPhone contains an internal digital compass located in the upper-right
corner of iPhone. The accuracy of digital compass headings may be
negatively affected by magnetic or other environmental interference,
including interference caused by the close proximity of the magnets