File:Japan prefectures-ja.png - Wikimedia Commons
TIP: Telephone codes in Japan and Taiwan generally go from high numbers in the south to low numbers in the north : r/geoguessr
The Japan Phone Number Code Explained
The Japan Phone Number Code Explained
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File:Japan Kansai Tokai telephone code areas.svg - Wikimedia Commons
Japan - The World Factbook
81 Country Code - Japan Phone Code 0081 - How To Call Japan From The UK
Driving in Japan : Where to Find All Your Mapcodes and How to Use Them - Ms Carefree Traveler
An analysis of telephone area codes for 420 Internet service providers... | Download Table
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How to Call Japan in 5 Easy Steps - wikiHow
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Press Release | ANA
PPT - Numbering Plan in Japan PowerPoint Presentation, free download - ID:4270062
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How to Call Japan in 5 Easy Steps - wikiHow
File:Japan telephone code areas.svg - Wikipedia
Guide to Japan's Country Codes | Byevisa.com
Japan Area Code and Japan Country Code
