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4
Precautions
Precautions
About usage of the terminal
• The terminal supports LTE, W-CDMA, GSM/GPRS and wireless LAN.
• Because your terminal uses wireless transmission, it may not function in
locations where it is difficult for radio waves to penetrate, such as tunnels,
underground passages and some buildings, in areas where radio waves are
weak, or out of LTE service area and FOMA service area. Even when you
are high up in a tall building or condominium and nothing blocks your view
outside, your terminal may not be able to receive or transmit signals. Also,
communication may be interrupted even when using without moving while radio
waves is strong and four antenna marks is displayed on your terminal.
• Because your terminal uses radio waves to communicate, it is possible that a
third party may attempt to tap your calls. However, LTE, W-CDMA, GSM/GPRS
system automatically applies a confidential communication function to all
calls, so even if a third party could somehow tap a call, they only hear noise.
• The terminal encodes voice communication as digital data. When you are
operating your terminal while moving to a location subject to weaker radio
wave conditions, the transmitted digital data may not be correctly decoded
and as a result the decoded voice may differ somewhat from the actual voice.
• Keep the data that you registered in the terminal separately by noting down
periodically or saving to microSD card, PC, etc. Note that DOCOMO cannot
assume any responsibility for any loss of saved contents of data resulting from
malfunction, repair, changing of the model or other handling of the terminal.
• As with PCs, some user-installed apps or accessed websites may give the
terminal instability of this terminal operation, or may send your location
information or personal information registered to the terminal to outside via
the Internet and the information may be used improperly. Therefore, verify the
supplier and operating conditions of the apps or websites before use them.
• The terminal automatically performs communications for some functions, for
example, to synchronize data, check the latest software, maintain connection
with the server, etc.
Additionally, when you download apps or watch video etc., a large amount
of packet communication charges are executed. Therefore, it is highly
recommended to use packet pack or packet flat-rate service.
• Depending on apps or services you use, a packet communication charges may
be charged even if you perform Wi-Fi communication.
• The terminal internal storage or the microSD card does not have enough
memory, running apps may not work normally. In such case, delete saved data.
• In case of loss of the terminal, set the screen lock password, etc. to ensure
the security of the terminal (P.109).
• If you lose your terminal, change password and disable certification of online
service accounts from PC so that Google Services such as Gmail, Google Play,
and SNS, etc. should not be used by others.
• For services and apps provided by any third party included Google LLC
thoroughly read the terms of use of Google LLC. NTT DOCOMO is not liable for
malfunctions, for any disadvantage brought to you caused by the app provided
by any third party included Google LLC you installed.
• If the terms of use, etc. appear, follow the instructions on the screen.
• Apps or services are subject to change without prior notice.
• The terminal does not support service providers other than sp-mode, mopera U
and Business mopera Internet.
• For details about usage fee, etc., refer to the NTT DOCOMO website.
• Although the display is manufactured with extremely advanced technology,
some dots may not be lit or be always lit. It is characteristic of the display and
not malfunction. Please be forewarned.
• DOCOMO shall not be liable for commercially available optional equipment.
Summary of Contents for Galaxy A21 SC-42A
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