Phone Assembly
MicroSD/memory cards expand the storage capacity of device and are sold separately. This device can use a microSD card up to 64GB.
The Missing SIM Notifcation will be displayed in the Quick Settings when there is no SIM card in the device.
REMOVE BACK COVER: Remove the back cover by inserting your thumbnail into the notch on the bottom right of the device and pulling down. 
INSERT/REMOVE SIM CARD: Insert the Nano-SIM card into the SIM slot with the metal contacts facing down and the notched edge going in first. Push until it is all the way in. To remove, simply slide it out.
INSERT/REMOVE MEMORY CARD: Insert an optional MicroSD card into the MicroSD card slot, with the metal contacts facing down and the notched edge going in first. Push until it is all the way in. To remove, simply slide it out.
Note: To prevent data corruption, it is recommended to unmount your memory card before removing it. To unmount your memory card, swipe down from the Notification bar with two fingers then select the Settings icon > select Storage > Eject icon.
INSERT/REMOVE BATTERY: Remove the battery by gently pulling up from the notch on the bottom. Place the battery in the battery slot with the gold contacts on the battery lined up with the gold contacts on the phone.
REPLACE BACK COVER: Place the cover on the back of the phone and gently push in until the cover clicks. The cover should be flush with the rest of the device.