Nokia 3120 EN - Manual (Page 25)

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2. To release the SIM card holder,
gently pull the locking clip of the
card holder (4) and open it (5).
3. Insert the SIM card into the SIM
card holder (6). Make sure that the SIM card is
properly inserted and that the golden contact area
on the card is positioned as shown.
4. Close the SIM card holder (7) and press it until it
snaps into position.