LG GD570AV Owner's Manual page 44

Getting Started
4 Place your thumbnail below the battery, as shown
below (1), and lift it up and out (2) (as shown).
5 Carefully slide the SIM card into the SIM card
socket as shown in the image below.
Make sure that the card's gold contacts face
downwards into the phone and that the upper-left
angled corner of the card is positioned, as shown.
42 LG dLite | User Guide