Your cell phone is set to automatically select a network?
For calls from your phone when dialing you do not know whether you are roaming or not. You will benefit from this application because it will indicate to you that you are in roaming. When you dial a number, your cell phone will vibrate three times and pop you a short message on the screen saying that you are currently in roaming.
This will help you to avoid surprises on your bill from the roaming operators that occur when you make calls and you do not know that you are using a different network.