Samsung Galaxy CORE PRIME User Manual page 20

► If your SIM card is not already installed, carefully
slide the SIM card into the SIM card slot.
Make sure that the card's gold contacts face into
the device and that the angled corner of the card is
positioned as shown.
Caution: If the card is not inserted correctly, the device
will not detect the SIM card. Re-orient the card and place it
back into the slot if the SIM is not detected.
Getting Started 8 Assemble Your Device