Sprint Nextel J120 - Manual (Page 71)

This is the Internet version of the user's guide. © Print only for private use.
70
Emergency calls
Mobile phones operate using radio signals, which cannot guarantee
connection in all conditions. You should therefore never rely solely
upon any mobile phone for essential communications (e.g. medical
emergencies).
Emergency calls may not be possible in all areas, on all cellular
networks, or when certain network services and/or mobile phone
features are in use. Check with your local service provider.
Antenna
This phone contains a built-in antenna. Use of antenna devices not
marketed by Sony Ericsson specifically for this model could
damage your mobile phone, reduce performance, and produce SAR
levels above the established limits (see below).
Efficient use
Hold your mobile phone as you would any other phone. Do not
cover the top of the phone when it is in use, as this affects call
quality and may cause the phone to operate at a higher power level
than needed, thus shortening talk and standby times.
Radio frequency (RF) exposure and Specific
Absorption Rate (SAR)
Your mobile phone is a low-power radio transmitter and receiver.
When it is turned on, it emits low levels of radio frequency energy
(also known as radio waves or radio frequency fields).
Governments around the world have adopted comprehensive
international safety guidelines, developed by scientific
organizations, e.g. ICNIRP (International Commission on Non-
Ionizing Radiation Protection) and IEEE (The Institute of Electrical
and Electronics Engineers Inc.), through periodic and thorough
evaluation of scientific studies. These guidelines establish permitted
levels of radio wave exposure for the general population. The levels
include a safety margin designed to assure the safety of all persons,
regardless of age and health, and to account for any variations in
measurements.