1. Place your device on a flat, clean surface with the display facing upwards.
2. Use your fingertip to pull out the SIM/SD door and the SIM/SD tray.
3. Place the microSD card into the first slot (larger than then others) with gold pins of the memory card also facing down.
5. Carefully insert the tray back into the SIM card slot and reposition the door.
The S42 supports MicroSD class 10 cards up to 128GB.