With the right setup, you can establish a Bluetooth connection between your Android device and the HC-05 module, and then send AT commands directly from your phone. It's pretty cool, if you ask me.
Now, I'm no expert on this topic, but I've heard that there are some apps out there that can help you get started with this. For example, there's one called "Bluetooth Terminal HC-05" that's specifically designed for controlling the HC-05 module from an Android device.