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Troubleshooting
Problem
Network not
displayed
Cannot make a
voice or video call
Cannot answer a
voice or video call
No ringing for an
incoming call
158
Possible cause
SIM card not installed correctly
Contacts between SIM card and
phone are dirty
Network signal is weak
SIM card is damaged
You are outside of your network
service area
A video call can only be made in an
area with UMTS/3G coverage.
Phone or SIM card is locked
Call Barring is active
A video call can only be received in
an area with UMTS/3G coverage.
Call Forwarding is active
Call Barring is active
Phone is set to not ring for incoming
calls
Possible solution
Ensure that the SIM card is inserted correctly
(see page 34).
Gently clean the contacts of the SIM card and
phone.
Move clear of any obstructions that may block
the signal.
Contact your service provider to obtain a
replacement SIM card.
Connect to a different network if this is
supported by your service provider
(see page 138).
Ensure that the icon indicating that you are in
an area with UMTS/3G coverage is displayed.
Unlock the phone or SIM card (see page 130).
Deactivate Call Barring (see page 134).
Ensure that the icon indicating that you are in
an area with UMTS/3G coverage is displayed.
Deactivate Call Forwarding (see page 135).
Deactivate Call Barring (see page 134).
Edit the ringtone settings (see page 133).
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