User's Manual

Troubleshooting 171
Communication problems
Phone does not
work
• The received signal can be too weak, possibly
because you are being shielded from the signal.
Check your display signal strength indicator.
Move outdoors or up from the ground to obtain a
sufficiently strong signal.
• Ensure the P900 is not set in Flight mode.
• Your P900 might be busy sending or receiving
data or email.
• Check the settings for forwarding or restricting
calls. See ‘Forward calls’ on page 52, ‘Accepted
callers’ on page 52 and ‘Restrict calls’ on
page 53.
• If
Emergency calls only is displayed on the
screen, you are not allowed to use the network
within range. You can, however, usually make an
emergency call using the emergency number.
• If
No network is displayed on the screen, you are
in an area that is not covered by a network or the
received signal is too weak.
Cannot hear
incoming call
• Increase the ringtone volume.
• Increase the ringtone volume.
The person I
talk to has
problems
hearing what I
say
• Ensure you do not cover the microphone when
you talk. You find the microphone at the bottom,
next to the connector.
• You could be almost outside the network range.
The sound improves with a better network
connection.
Cannot use
WA P
• Your subscription does not include WAP. Check
with your service provider.
• The settings are not correct. Enter new settings.
Contact you service provider or visit
www.SonyEricsson.com/support and use the
WAP configurator.
Cannot send or
receive SMS or
MMS
• Your subscription does not include SMS or
MMS. Check with your service provider.
• Check with you service provider that you have
entered the correct Service Center phone
number.
• Check the settings in the Control panel. Contact
you service provider or visit
www.SonyEricsson.com/support and use the
MMS configurator.
• Ensure Flight mode is deactivated.
• Phone memory might be full. Delete some
pictures or music, for example.