<P> The International Telecommunication Union ( ITU ) has established a comprehensive numbering plan , designated E. 164 , for uniform interoperability of the networks of its member state or regional administrations . It is an open numbering plan , however , imposing a maximum length of 15 digits to telephone numbers . The standard defines a country calling code ( country code ) for each state or region which is prefixed to each national numbering plan telephone number for international destination routing . </P>
<P> The International Telecommunication Union ( ITU ) has established a comprehensive numbering plan , designated E. 164 , for uniform interoperability of the networks of its member state or regional administrations . It is an open numbering plan , however , imposing a maximum length of 15 digits to telephone numbers . The standard defines a country calling code ( country code ) for each state or region which is prefixed to each national numbering plan telephone number for international destination routing . </P>
what is the maximum length of phone number
what is the maximum length of phone number
15 digits
15 digits