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You would need to append a file via CLI/SSH called rc.local located in /etc directory with a command of a similar structure:
An alternative would be to add the above command in the WebUI System -> Custom scripts section.
This way the command will be executed every time after the router finishes after restart or powering on.
Check these links:
Also, for direct communication with the modem, refer to the manual below:
To execute AT commands, use the following syntax:
gsmctl -A '<AT_command>'