Definition of 800 number noun from the Oxford Advanced Learner's Dictionary

 

800 number

 noun
noun
BrE
 
; NAmE
 
 
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(in the US) a telephone number beginning with 800, or with some other numbers starting with 8 such as 888, which can be called free of charge. These numbers are provided by companies so that customers can telephone them to order their products, etc. In Britain such free numbers begin with 0800.
See the Oxford Advanced American Dictionary entry: 800 number