Samsung Galaxy S III User Manual page 16

Caution! Turn the phone off before installing or removing the
SIM card. Do not bend or scratch the SIM card. Take
care when handling, installing, or removing the SIM
card, and avoid exposing the SIM card to static
electricity, water, or dirt. Keep the SIM card out of
reach of small children.
9
Installing the 4G LTE SIM Card
1. Remove the back cover.
2. With the Verizon Wireless logo facing up, carefully
insert the 4G LTE SIM Card into the slot, pressing gently
until it locks into place.
3. 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.
4. Install the back cover.
Note: If the card is not inserted correctly, the phone will not
detect the SIM card. Re-orient the card back into the
slot if the SIM is not detected.