LG Optimus L7 II Guide De L'utilisateur page 480

Troubleshooting
Message
Any
application
cannot be
set
Calls not
available
Phone
cannot be
switched on
88
Possible causes
Not supported by
service provider
or registration
required.
Dialling error
New SIM card
inserted.
Pre-paid charge
limit reached.
On/Off key
pressed too briefly.
Battery is not
charged.
Battery contacts
are dirty.
Possible corrective measures
Contact your service provider.
New network not authorised.
Check for new restrictions.
Contact service provider or reset limit
with PIN2.
Press the On/Off key down for at least
two seconds.
Charge battery. Check charging
indicator on the display.
Clean the battery contacts.