Install and remove the SIM and memory card (MicroSD).
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INSTRUCTIONS & INFO
The Missing SIM icon will be displayed in the Notification bar when there is no SIM card in the device.
The SIM & microSD tray is located on the top right of the device. To insert a SIM card, first remove the SIM tray by inserting your thumbnail into the notch on the top of the device and lifting up.
Insert the Nano-SIM card into the SIM tray with the gold contacts facing up and the notched edge in the lower right.
Insert the microSD card into the SIM tray with the gold contacts facing up and the notched edge in the lower right.
Note: MicroSD cards aresold separately.The Red Hydrogen One can use a microSD card up to 256GB. To prevent data corruption, it is recommended to unmount your memory card before removing it. To unmount your memory card, from the home screen select the Settings app > Storage > Eject icon.