After going to RQ4 to add minutes, what is the next step to take?

The appropriate follow-up action after going to RQ4 to add minutes is to input the tender sales information. This step is critical as it documents the transaction and ensures that the minutes added to the customer's account are accurately processed and charged. Recording this information properly also helps maintain transaction integrity and assists in tracking sales for inventory and accounting purposes.

The other options may be related to customer service tasks but do not directly pertain to the immediate action required after adding minutes. For instance, recording a customer's complaint does not follow the minute addition and should be handled at a different point of interaction. Navigating to the main menu does not contribute to finalizing the transaction, and checking the device's battery level, while potentially useful in another context, is irrelevant to this particular process.