Samsung Galaxy S4 User Manual page 22

Note: If the card is not inserted correctly, the device will not detect it
and no service will be available. If this happens, turn off the
device, remove the card, and reinstall the card in the correct
orientation.
Installing the microSD Memory Card
Your device supports an optional (external) microSD™ memory
cards for storage of media such as music, pictures, video and other
files. The SD card is designed for use with this mobile device and
other devices.
Note: This device supports a memory card of up to a 64GB.
1. Remove the battery cover.
2. Locate the microSD card slot on the inside of the device.
3. Orient the card with the gold strips facing down.
4. Carefully slide the microSD card into the card socket until it
clicks into place.
Important! Be sure to align the gold contact pins on the card with the
phone's contact pins.
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