If a SIM is not in the device, the Signal Strength icon will blink red.
INSERT/REMOVE SIM CARD & BATTERY: Using your thumbs, apply pressure to the left and right sides on the back of the device then slide down to remove the back cover.
Remove the battery by gently pulling up from the notch on the bottom.
Push the nano SIM into the SIM slot with the metal contacts facing down and the notched edge to the upper left until it clicks in place. Note: The SIM slot is spring-loaded. To remove the nano SIM card, press the nano SIM card into the slot until it springs out.
Place the battery in the battery slot with the gold contacts on the battery lined up with the gold contacts on the device.
Place the cover on the bottom of the device and gently push up until the cover clicks.
ATTACH EXTERNAL ANTENNA (optional): From the back of the device, remove the plastic covers then insert the antenna into the TS-9 ports.