Welcome to our Community and thanks so much for you very first post 🙂 As our user @BenMcr has advised, your talk plan will include 03 numbers. As he's also mentioned, you will need to hang up before the hour mark and redial to avoid being charged for the call.
You can see what your package has included via this link
For a more in depth look at your talk plan and to see any charges for call outside your talk plan, you can check that here
Hope that helps, you know where we are if you need anything further.