Samsung SGH-T401G Series User Manual page 9

Lift up and remove the battery.
3.
Carefully slide the SIM card under the metal bracket and into the SIM card
4.
socket until the card locks into place. Make sure that the card's gold contacts
face into the phone and that the 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.
Replace the battery:
5.
Getting Started 5