The format can vary – 1, 43, 962 1868 are all valid codes.There isn’t necessarily a one-to-one mapping; 44 for example, is used not just for the United Kingdom but for the Isle of Man, Guernsey and Jersey.Whole countries come and go, introducing new country prefixes.New classifications of numbers introduce new numbering systems – premium-rate, local-rate, toll-free, and so on.
Even international dialing codes, however, aren’t as straightforward as you may think.
Then, of course, there was the enormous and unprecedented growth in mobile.
No longer was the number of telephone numbers required largely limited to the number of households, but many times over.
Numbers must also be altered according to where you’re dialing from.
From abroad, to call a UK number you need to drop the leading zero and prefix with the dialing code 44: Thankfully, there is a format we can use which enable us to get around these variations.
The continued strain on the pool of available numbers can only increase the likelihood of further changes.