Samsung GT-S3370 - Settings; Application settings; Security; Network settings

Assembling
9
Insert the SIM or USIM card.
3
Place the SIM or USIM card into the phone with •
the gold-coloured contacts facing down.
If you do not insert a SIM or USIM card, you can
•
only use your phone’s non-network services and
some menus.
To install the SIM or USIM card and battery,
If the phone is on, press and hold the Power/End key
1
to turn it o.
Remove the back cover.
2
Be careful not to damage your ngernails when you
remove the back cover.