It is connected when the IP address of your SIM card shows up.
AT Command
The built-in modem supports AT command for managing and configuration of
the modem. In 3G/4G Modem section, Click AT Command.
• Shortcut: There are several pre-configured AT commands that you can use
directly. If you want to run your own AT command, choose Manual
command.
• AT Command: The place where you can input AT command. For the list of
AT command, please refer to the AT command manual of the built-in
modem.
• Port: The default port for AT command is /dev/ttyUSB2.
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