Telephone numbers are typically composed of an international call prefix, a country calling code and the local telephone number. To aid legibility, they are split into groups, using non-breaking spaces between the groups so that these never become separated at line breaks. To do this in a Word document, first write the number all together (e.g., 0034934016186) and then position your cursor between the first two groups of digits you want to separate (00|34) and press Control+Shift+Space. Then do the same with the next groups (34|934) and repeat the process until you have created all the non-breaking spaces you need. (To do this in an HTML document, insert the entity   in that same position.) In the Catalan-speaking territories, group the digits after the country calling code in threes.



Note that the international call prefix (00) used to dial out of a country is generally replaced by a plus sign. This is joined to the country calling code, which is used to dial into a country.



Telephone extensions are written at the end of the number, also after a non-breaking space, in brackets.



Avoid using hyphens, dashes or points to join groups of digits.