Samsung SGH-T249DABTMB - Manual (Page 9)

Getting Started 6
4. Carefully slide the SIM card into the SIM card 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 will not detect the SIM card. Remove the battery and re-orient the card back into
the slot.