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Phone calls between subscribers of the same provider are usually free when flat-fee service is not available. [8] A VoIP phone is necessary to connect to a VoIP service provider.
A long number (e.g. +44 7624 800555 in international notation or 07624 800555 in UK national notation), also known as a virtual mobile number (VMN), dedicated phone number MSISDN or long code, is a reception mechanism used by businesses to receive SMS messages and voice calls.