Coverage
For enterprise:
The coverage manages the roaming profiles. The roaming profile contains a set of mobile operators, visited networks in the different countries where you want to allow the endpoint to connect to. This allow you to control where the endpoint(s) can use the service.
For reseller:
The coverage manages the Destination group. The Destination group is a combination of multiple operators. After created, the destination group is attached to the Rate zone which is then attached to the tariff. The tariff is attached to rate plan and when a service is consumed, the corresponding tariff is applied.