No, a disconnected phone number cannot be used to locate a person in real-time. Because the line is no longer assigned to an active subscriber, it does not register with any cellular towers or transmit signals that could reveal a current physical location.  While the original area code and prefix might indicate a general registration region, this data is often outdated and does not reflect where the device is currently operating.  Consequently, any attempt to track a person via a disconnected number will yield no usable geographic information. 

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