Zte SPRO Quick Start Manual page 11

2. Hold the microSDHC card with the cut edge oriented as shown below.
The gold contact should be facing up. Push the card into the card slot
until it clicks into position.
NOTE:
Some applications may require a microSDHC card to work properly if it
stores certain data on it. Therefore, it is recommended that you keep a
microSDHC card installed and not remove or replace it unnecessarily.
3. Close the cover.
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