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These codes are also important in the telecom switch. Without the correct codes the switch will route calls to the wrong part of the world or not connect calls at all.
When considering the build, buy or outsource question it is important to consider how often your codes will be maintained. If you are running your own billing system you may need to purchase updated codes from someone or roll your own using some of free sites listed below.
Here is the list of sites to get worldwide dialing codes.
- Very extensive listing of country and city codes. It is very detailed. It is an excellent resource for free information on worldwide country and city codes. This is the one I use most often to monitor changes in codes.
- Lookup US area codes, international country calling codes and world city dialing codes in alpha and numeric directory.
- A detailed look into codes in the United Kingdom. They also sell a version that can be loaded into your own billing database.
- Listings of country and city codes world wide. Some countries list cities and some do not. A plus is that it differentiates between land line numbers and cellular numbers. They also sell a version that can be loaded into your own database at a very low price.
- Lists top country level codes with links to sites with city level codes. Also contains links to carriers that operate in the country.
- Lists codes for major cities and rates for Americom. Also contains interesting facts about the telecom infrastructure in the country.
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