Pantech PG-C120 User Manual page 16

To avoid memory corruption of your SIM card, always switch off your
phone before removing or inserting your SIM card.
3.2 Installing/Removing the SIM card
1. Remove the battery from the unit.
2. If the SIM slot is empty, insert the SIM card into the slot.
3. If you want to remove the SIM card, push the SIM card in the arrow
direction as shown in the picture.
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