Samsung SGH-T119 Series User Manual page 8

Carefully slide the SIM card into the SIM card socket until the card locks into place. Make sure that the card's
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gold contacts face into the phone and that the upper-left angled corner of the card is positioned as shown.
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.
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