Nokia 3310 User Manual page 23

1. Remove the back cover:
Press the locking catch (1), slide the cover (2), and lift the cover (3).
2. Remove the battery:
Push the two release catches in the opposite directions (4) and
remove the battery (5).
3. Insert the SIM card:
Slide the SIM card carefully into the SIM card slot (6).
Make sure that the golden connectors on the card are facing downwards
and that the bevelled corner is on the left.
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