Yes, you need a GSM modem and a SIM card from your local mobile network provider.
To configure your GSM modem, you can automatically determine its settings using wvdialconf. The output contains relevant information, such as baud rate, serial port used, and modem initialization string.
To verify that your modem is working correctly, you can use minicom. Minicom acts as a terminal for any serial device (in this case, a GSM modem), and with it you can send AT commands to your modem.
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