• Usually, the area code is a dead giveaway.
  • In the UK it seems to be anything with a different area code. This could sometimes be a house just across the road. I can call my family and friends in the rest of the world ( via a third party) cheaper per minute than I can call friends 3 miles down the road.
  • Try this site... it is a bit rough but did the trick for me and I had the exact same question. Specifically:

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