Greetings! Here we have a rare gif of the vaunted hacker-cat we posed your question to...

The network IDs are not static! Characters are welcome to change them ICly — however, there is serial number metadata that is static associated with every device, so anyone skilled enough with hacking could in theory (with player permission) discover that many IDs are associated with only one serial number. If she becomes or is aware of this, Nikita could periodically cycle out her 'smartwatch' device for others — through theft, trickery, or the simple act of taking one off a body.