Automating data reset on SIM cards using USSD commands can be a efficient way to optimize data allowances without requiring manual intervention. Unstructured Supplementary Service Data is a real-time protocol used by GSM networks to exchange brief commands. Unlike web portals, USSD works without an internet connection, making it perfect for remote areas.

Various telecom operators offer specific USSD codes to reset or refresh data allowances. These codes commonly follow patterns like 123or 555#. Implementing scheduled resets involves setting up a solution that initiates resets under predefined conditions, such as when data usage exceeds a limit.

A common method is to use a 2G connected to a single-board device like a BeagleBone. The modem can be managed using command-line instructions over a RS-232 interface. By writing a Bash automation script, you can initiate the request. For example, sending AT+CUSD=1,"123#",15 will initiate the USSD request. The modem will then output a textual reply, which can be checked for success keywords to verify the reset succeeded.

Setting up task automation enables fully hands-off operation. For instance, a user might reset data after midnight on the 1st of each month to maximize speed. The system can also check current usage via another USSD code and skip reset if under limit, ensuring minimized waste.

Important to remember that not all carriers support data resets via USSD. Alternative methods include logging into a web portal. Always check official documentation that the command sequence is recognized by the network. Also, repeated triggering may violate your service terms, so review your terms and conditions before deployment.

Security is a vital concern. If the automation system is online, ensure it is properly secured. Do not use default logins on the device. The controller should have minimal internet exposure to reduce attack surface.

This method is especially valuable businesses managing fleets of IoT devices, industrial telemetry units, or any scenario requiring zero-touch management. It also benefits users with limited plans to avoid overage fees without daily checks.

This solution reduces workload, it is not a replacement for understanding your plan. Check usage dashboards to detect anomalies. Always test with a single SIM before rolling out broadly.

To conclude, controlling mobile data via automated USSD is a practical solution for anyone needing to manage mobile data efficiently. With the suitable modem, a robust automation tool, and approved protocols, it can become a reliable method to ensure uninterrupted service without overspending.