How Accurate Is Mobile Number Prefix Tracking?
Prefix-based tracking can be useful, but it is not exact. It works best as a broad telecom-reference tool, not as a precise or current locator.
Number portability, operator changes, data staleness, and evolving coverage records can all reduce accuracy. A useful result can still be informational without being exact.
That is why responsible websites should explain both the usefulness and the limitations of this method.