Samsung Katalyst User Manual page 9

Carefully lift the battery cover away from the bottom of the phone.
2.
Carefully slide the SIM card under the metal bracket and into the SIM card
3.
socket until the card locks into place. Make sure that the card's gold
contacts face into the phone and that the upper-left angled corner of the
card is positioned as shown below.
Note: If the card is not inserted correctly, the phone does not detect the SIM card. Remove the battery and
re-orient the card back into the slot.
Activating Your Phone
Getting Started 6