In the tracker settings section of the application, there is setting for network modes. This allows you to change your tracker's configuration from Domestic (USA) to International and vice versa.
The mode switch is an Over the Air command that requires your tracker to be awake and connected to the platform. When that is the case, the command will execute immediately.
It is important to note that the mode switch should always be done while the tracker is in the US. For example, if you are traveling from the US to Europe, the change from domestic mode to international mode needs to made prior to you leaving the country. Then, when you return to the US from Europe, the change back to domestic from international mode needs to be done when you arrive back in the US.
This will ensure that your device is able to connect to the proper networks for your current location and give you a smooth tracking experience.