Callers should use a plus sign (+) prefix in front of any international call prefix. The goal of the international phone number standard is to have valid telephone numbers represented consistently. Using the conventions described above, the example E.164 phone number is +447911651780.Lastly, the sequence must include a subscriber number (SN), such as 651780.
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The E.164 standard eliminates the formatting ambiguity through the following rules: It defines the structure and functionality for the following four principal categories of numbers: It is called ITU-T E.164 or simply E.164.
To simplify telecommunication numbering, there is an internationally-recognized phone number format. The number of people relying on mobile phones is rapidly increasing and the dwindling pool of available phone numbers is likely to have further implications on international phone conventions. Lastly, you have to account for the massive growth of mobile communications. In addition to landline and mobile phone numbers, authorities gradually introduced new versions – national service, business, and alternative numbers. South Korean phone numbers can be as short as seven digits or as long as 11 digits, but that hasn’t always been the case. Once telephone providers reach the limits for premium numbers, they can simply announce a new type of code.Ĭonventions can also drastically change over time. Since telephone numbers are managed by the national telecommunications authorities, those dialing systems also no longer exist.Ĭountries can also propose and implement new classification systems – premium-rate, local-rate, toll-free, etc. In the 20th century, nine countries ceased to exist. When considering international dialing systems, you must think about both internal and external factors. In this case the number dialed would be 011 00636. If you’re dialing the UK from the US, conventions require entering the digits 011, which signals that you are making a call outside of the United States. Also, an international phone prefix could be 00 instead of “+” so 00636 would be another expression of the same phone number. It would make a local number look like 020 7946 0636.īut an international number format normally starts with +44, so it would be +44 20 7946 0636. For instance, in the United Kingdom there are geographic numbers officially approved by the Office of Communication, such as 020 for London or 01865 for Oxford. For one, 7, 55, 351, and 1809 are all equally valid codes but there are still complications to these systems.The prefix +1 works for both the United States and Canada, whereas +34 works for Spain and the Canary Islands.Īdditionally the conventions for dialing telephone numbers vary depending on where you’re calling from. If your business intends to manually manage phone numbers from clients, you might not need the mechanisms for international contact verification.Businesses must still keep in mind though the complexities of international dialing codes.This is especially important if you want to introduce some level of automation.įiguring out a valid country prefix presents challenges as well. The goal for phone number validation is to be able to check whether, for example, +1-54 or 19-49-88 are actual phone numbers. Still, in some cases, a telephone number can take on a format using various special characters including plus signs and parentheses or take on a wholly different format than another country or region. There are universal rules, such as limiting the length of digits or the number containing only numerical values (with slight deviations).
A typical solution is to use regular expressions to make sure the value looks like a valid phone number.Ī valid phone number can take on a variety of forms depending on the region. That being said, the solution should be one that works with multiple countries and carriers. The problem is getting people to enter their phone numbers in the correct format. The ability to collect a phone number allows businesses to verify information from clients, expand outreach, and ensure a business is dealing with a true client and not a bot. It comes as no surprise to any business owner that communication is key.
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