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7. Precautions
1) SIM card replacement
When replacing the SIM card in live condition, press the
button under the slot. When the red LED is on, it indicates
that the replacement can be conducted (when the red LED
is on, the SIM will be disconnected, no matter the card is in
use or not). After the replacement, press the button again,
the SIM card will automatically connect the corresponding
remote-end device.
2) SIM card direction
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