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Each subscriber is associated with a subscriber ID. The basic required entity is the subscriber ID value, which is assigned when the subscriber account is created. The subscriber ID can be used to modify subscriber information. When you associate a subscriber with a service, you can use the subscriber ID or the listed subscribe name.
The subscriber ID is used in service creation. It is often the first step because, in most cases, new services are added to existing subscribers. A subscriber can have more than one associated service.