Zte Spro2 - Powering On, Off, and Restarting; Waking the Device from Sleep

16
2. Place the microSDHC card on the tray as shown and carefully
install the tray back.
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.