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| Area or operator | From abroad | Inside the country |
|---|---|---|
 Ulm Donau · Germany | +49 731 … | 0731 … |
 Adamsville, TN · United States | +1 731 … | 1731 … |
| Alamo, TN · United States | +1 731 … | 1731 … |
| Bells, TN · United States | +1 731 … | 1731 … |
| 33 more in United States | ||
 Zhuzhou/Changsha/Xiangtan, Hunan · China | +86 731 … | 0731 … |
 Indore, Madhya Pradesh · India | +91 731 … | 0731 … |
 Pabna Bera · Bangladesh | +880 731 … | 0731 … |
 Lahat · Indonesia | +62 731 … | 0731 … |
 ITPC · Iraq | +964 731 … | 0731 … |
 Tanzania Telecom · Tanzania | +255 731 … | 0731 … |
 Airtel · Uganda | +256 731 … | 0731 … |
If a number starts with +, the first 1–3 digits are the country code. If it starts with 0 (8 in Russia and Kazakhstan), it is a domestic number: an area or operator code follows, and from abroad the 0 or 8 is replaced with + and the country code. The same digits can mean different places, so where the call came from matters.