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单词 number portability
释义

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number portability
number portability n. Telecommunications a facility which enables customers to transfer from one from one telephone company to another without having to change their telephone number.
ΚΠ
1988 Network World (Nexis) 4 Apr. 3 Number portability will allow users to choose any exchange for their 800 numbers or retain the ones they have, regardless of the carrier they choose for service.
1999 Evening Post (Bristol) (Electronic ed.) 14 Dec. The introduction of number portability, where customers can keep their old number even if they change networks, has made it easier to swap to the most cost-effective network.
extracted from numbern.
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