Sony XPERIA 1 Instruction Manual page 238

International roaming
■
Cannot use the terminal overseas (when
is displayed).
Do you subscribe to WORLD WING?
･
Check if you subscribe to WORLD WING.
Cannot use the terminal overseas (when
is displayed).
Check if you are out of the international
･
roaming service area or in an area with
poor signal strength.
Check if the service area and network
operator are available or not, refer to NTT
DOCOMO website.
Change the network settings or overseas
･
network operator settings.
- Set "Preferred network type" to "4G
(preferred)/3G/GSM".
- Turn on "Automatically select network".
P.224
→
Turning the power off and on may solve
･
the problem.
→
Cannot perform data communication
overseas.
Turn on "Data roaming".
･
P.225
→
P.44
P.224
→
The terminal suddenly became
unavailable while using overseas.
Check if usage amount exceeds the limit
･
of maximum charges for use.
For use of "International roaming (WORLD
WING)", the limit of maximum charges for
use is set in advance. If the limit of
maximum charges for use is exceeded,
pay the charges.
Cannot receive calls overseas.
Is "Restricting incoming calls" set to
･
"Activate restriction"?
No caller ID is notified/a notified caller ID
is different from that of the caller/
functions for using contents saved in
phonebook or those using Caller ID
notification do not operate.
Even if a caller notifies its caller ID, it is not
･
displayed on the terminal unless the
network or network operator notifies it.
And a different caller ID may be notified
depending on the network or network
operator you use.
Data management
■
Data transfer is not performed.
Check if USB hub is used. If you use USB
･
hub, operations may not be performed
correctly.
P.228
→
Appendix/Index
236