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iNUM (short for Internet Number) is a +883 that is recognized by the International Telecommunications Union, and therefore recognized as a standard PSTN (Public Switched Telephone Network) number. However, due to lack of real enforcement, +883 telephone numbers do not seem to be recognized in the United States by most cellular or POTS Phone service providers.

Google Voice will charge $0.01 per minute for such calls. Many SIP providers will not charge for calls, and will provide a request for a +883 telephone number.


Google Voice