English

Definition of 900 number noun from the Oxford Advanced Learner's Dictionary

 

900 number

 noun
noun
BrE
 
; NAmE
 
 
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(in the US) a telephone number that begins with 900. A call to it is more expensive than those to ordinary numbers, and part of the charge for the call goes to the business being called. 900 numbers are used by companies who have 'chat lines', operate competitions, offer services, etc.
See the Oxford Advanced American Dictionary entry: 900 number