900 number
noun/ˌnaɪn ˈhʌndrəd nʌmbə(r)/
/ˌnaɪn ˈhʌndrəd nʌmbər/
- (in the US) a phone 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 chatlines, operate competitions, offer services, etc.
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900 number