The UK user should present their number like this: If you need a refresher, look back at a very old (from 2010!), but still useful blog post on the subject. Now, the UK user shouldn't be expected to know the international trunk prefix for countries other than his own, so when presenting their number on business cards, web pages or emails, they should use the internationally recognized standard for phone number presentation, which is (DRUMROLL).E.164!!!! Regular readers of my blog and anyone who knows Lync/Skype for Business should be intimately familiar with E.164 formatted numbers. If that US person tried to insert the UK national call prefix in the number (01144 02034567890), it would fail to connect because trunk prefixes are not used outside the home country. Continuing my earlier example, dialling that same London, UK phone number from the US would start with my international call prefix (011), then the UK country code (44), the London area code (20), and finally the subscriber number (3456 7890), resulting in 011442034567890. Trunk prefixes are NOT used outside of the country. Italy is another unique case in that they don't have a national trunk prefix, but they DO use 0 as the beginning of the area code, which can confuse people. NANPA countries are unique in that the country code 1 is also used as a sort of trunk prefix for long-distance calls. Russia and 5 other former USSR states use 8.26 countries use 1 (these are countries that are part of NANPA, like US/Canada and many Caribbean countries).101 countries don't use a trunk prefix at all.The actual national trunk prefix usage breakdown (based on my research) is below: Not every country uses a trunk prefix, but those that do generally use 0 as a trunk prefix. If I were sitting in Liverpool and wanted to dial someone in London, I would have to dial 0, then the area code for London (20), then the subscriber phone number (say 3456 7890). The trunk prefix is a way to signal the telephone network that the dialed number is a long-distance or national-level call.įor example, the trunk prefix for UK national calls is 0.
First of all, I spend far too much time thinking about dial rules.įor those who don't know, a trunk prefix is a number (or numbers) that typically has to be dialled prior to dialling a phone number within the subscriber's country, but outside the subscriber's home area code.
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