Samsung Galaxy A21 SC-42A, Инструкция по эксплуатации, Страница: 140 / 159

138
Appendix
Trouble Check and remedy
Cannot connect
calls (out of area
does not disappear
even when you
change the
location, or cannot
make/receive a call
even when radio
wave when strong). • Turn the power off and on, or remove and attach
the docomo nanoUIM card. → P.30, P.23
• Due to the radio wave types, making/receiving calls
may be unavailable even in the service area and
even when strong radio wave is indicated in 4 signal
marks. Move to the other place and call again.
• Is the terminal set to "Block numbers"? → P.64
• Due to the crossing of radio waves, at the
crowded public places, calls/mails are crossed
and the connection status may not be good. In
that case, calling sound is played. Move to other
place or call again at other time.
Cannot connect to
network. • Do you use at a place where signal is weak?
• Turning the terminal power OFF and then turning
ON again may work for the restoration. → P.30
‡
Display
Trouble Check and remedy
The display is
dimmed. • Is the time set on "Screen time out" over? →
P.107
• Do you adjust the brightness of the display? →
P.107
• Is the terminal set to power mode?
→ P.116
• Is the battery level low? → P.122
‡
Voice
Trouble Check and remedy
During a voice call,
the other party's
voice is hard to be
heard to or too loud. • Do you change the listening volume? → P.62
‡
Mail
Trouble Check and remedy
Mail is not received
automatically. • Do you set "Sync contacts" to OFF? Set it ON. →
P.73
‡
Camera
Trouble Check and remedy
Still images and
videos shot with the
camera are blurred. • Check if clouds or dirt attach to the lens of
camera.
Cannot launch
Camera • Wait for a while and retry the operation or turn the
power off then turn on the terminal. Check the battery
level and available memory space of the terminal.
Recording failed • Exit the camera app and restart the app.
‡
Osaifu-Keitai,
Trouble Check and remedy
Cannot use Osaifu-
Keitai. • If you activate Omakase Lock, Osaifu-Keitai
function cannot be used regardless of NFC/
Osaifu-Keitai lock settings.
• Check if you activate NFC/Osaifu-Keitai lock.
→ P.88
• Check if you hold the mark position on the
terminal over a reader. → P.88
‡
International roaming
Trouble Check and remedy
Cannot use the
terminal overseas. ■ If the signal mark is displayed
• Do you subscribe to WORLD WING?
Check the subscription of WORLD WING.
■ If out of area is displayed
• Are you out of the service area of the international
roaming service or in weak radio wave area?
Check if it is available service area or overseas
network operator with NTT DOCOMO website.
• Try to change the network settings or settings
for overseas communication operator.
Set "Network mode" to "4G/3G/GSM (auto
connect)". → P.131
Set "Network operators" to "Select automatically".
→ P.131
• Turning the terminal power OFF and then turning
ON again may work for the restoration. → P.30