Zte Blade A31 Quick Start Manual page 7

NOTE:
Both nano-SIM slots support LTE networks and either
can be used for mobile data.
3. Insert the optional microSDXC card to the slot
above the nano-SIM slot 2.
4. Insert the battery, making sure the connectors
align. Gently push down on the battery until it
clicks into place.
5. Replace the back cover.
6