telephone keypad letters to numbers - GADGET
In many countries, the digits on the telephone keypad also have letters assigned. By replacing the digits of a telephone number with the corresponding letters, it is sometimes possible to form a whole or partial word, an acronym, abbreviation, or some other alphanumeric combination. The recommended style of presentation of new telephone numbers is based on customer research.
Context Explanation
Brackets are used to identify the national code - which is omitted when dialling within the same area. In the UK 'phone book' is an informal name for what would be more formally described as 'the telephone directory'; however, the much reduced version still issued by British Telecom actually calls itself The Phone Book. It contains both residential and business numbers, but there is also a separate classified business directory printed on yellow paper and called The Yellow Pages in imitation of ...