Nokia 6100 - Manual (Page 21)

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1 Use a fingernail as a lever to unlatch
the metal SIM card holder.
2 Swing the SIM card holder open.
3 Insert the SIM card into the holder
as shown, beveled corner first, with
the gold contacts on the SIM card
face up (away from the phone).
4 Swing the SIM card holder closed.
The gold contacts on the SIM card
will meet the gold contacts on the
inside of the phone.