LG C3380 Guide De L'utilisateur page 127

Settings [Menu 7]
When needed [Menu 7-8-2]
If you select When needed, the phone will use a GPRS
connection only if you start an application or action that
needs it. The GPRS connection is closed after it is no
longer required by any application.
!
Note
If there is no GPRS coverage and you have chosen Automatic, the
phone will periodically try to establish a connection.
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C3380