A toll-free telephone number for international calling. A UIFN charges the cost of the call to the called party. Standardized by the ITU-T, the numbering convention for UIFNs is 800 + 8 digits. See also ITU-T and toll free service.
"UIFN." YourDictionary, n.d. Web. 31 May 2019. <https://www.yourdictionary.com/uifn>.
UIFN. (n.d.). Retrieved May 31st, 2019, from https://www.yourdictionary.com/uifn
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