0870 number - definition and synonyms

noun [countable] 

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/ˌəʊ eɪt ˈsev(ə)n əʊ ˌnʌmbə(r)/
singular0870 number
plural0870 numbers
  1. in the UK, a telephone number beginning with 0870 that is usually for calling business services such as help lines. The customer pays for the call.