NetCloud Essentials for Mobile Routers subscription and the NetCloud Essentials for Ruggedized IoT subscription are both base subscriptions.
Both subscription types are compatible with the IBR900 device.
The IBR900 can only be licensed to one base subscriptions at a time, not both.
Accounts with both subscription types may find use cases where the IBR900 that is licensed to NetCloud Essentials for Mobile Routers subscription, would be better suited to be license to, and use the features for, the NetCloud Essentials for Ruggedized IoT subscription (and vice versa).
If there are available license(s) for the base subscription the account wants to move the device to, NetCloud users of that account can change the base subscription of a device with the Change Subscription feature.