Samsung SGH-ZX20ZKACIN - Manual (Page 8)

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3. Slide the SIM card into the SIM card socket, as shown, so that the card
locks into position.
Make sure the gold colored contacts of the card face into the phone.
4. To remove the SIM card, slide it upwards as shown.
5. Replace the battery so that the tabs on the end align with the slots at the
bottom of the phone.