An area code may tell you where a range was assigned, not where the subscriber is standing today.
Allocation is historical context
A national authority publishes geographic numbering assignments. These are records about number blocks.
Devices move
Mobile service, call forwarding and internet calling do not bind the caller to the original area.
Avoid map precision
Do not display a street, GPS pin or “live city” from a prefix alone.
Three ways the location inference fails
Even a correctly identified geographic area code does not answer “where is this person now?” These examples describe possible situations, not a particular caller.
The user travels
What the area code retains: Its numbering-plan assignment
What changes independently: The user’s physical position
Calls are forwarded
What the area code retains: The original called number’s area code
What changes independently: Where the call is answered
A service handles calls remotely
What the area code retains: The geographic numbering assignment
What changes independently: The place or device receiving calls
Use area-code information to understand numbering geography. Do not use it as confirmation of a caller’s address or travel history.