Nokia 3300 - Manual (Page 43)

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6 Close the SIM card holder (6) and push up to lock (7).
7 Insert the battery (8) with the gold contacts on the battery aligned with
the gold contacts in the battery slot.
8 To replace the back cover (9), insert the locking catches on the back cover
in the corresponding slots in the phone, and slide the cover until it locks
into place.
6 7
8 9