Sometimes we still don't know the name or the device. For example, this is the case if the person was contacted on some platform and we only see the number associated with that service, such as a phone number or an account number.
All we have at that point is a number associated with the account that was used to communicate with the victim—whether by sending images or messages, making calls, or something like that. Afterward, since we don't know who sent the information, we have to find out who is associated with that account, where that person is located, and what other services may be provided to that person.