Zte Blade A3 Prime User Manual page 14

2. Hold the nano-SIM card with the cut corner oriented as shown
and the microSDXC card with the metal contacts facing down
and slide them into the card slots.
NOTE:
Some applications may require a microSDXC card to work
normally and/or may store data on the card. Therefore, it is
recommended that you keep a microSDXC card installed and not
remove or replace it randomly.
3. Replace the cover over the back of the phone, and then press
down along the edges to secure. Make sure there is no gaps
around.
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