Editing E.164 (section)

==Numbering formats==
The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public [[telecommunications]].

For each of the categories, it details the components of the numbering structure and the digit analysis required for successful [[routing]] of calls. Annex A provides additional information on the structure and function of E.164 numbers. Annex B provides information on network identification, service parameters, calling/connected line identity, dialing procedures, and addressing for Geographic-based [[ISDN]] calls. Specific E.164-based applications which differ in usage are defined in separate recommendations.

The number categories are all based on a fifteen-digit numbering space. Before 1997, only twelve digits were allowed. The definition does not include any [[international call prefixes]], necessary for a call to reach international circuits from inside the country of call origination.

===Geographic areas===
{| class="wikitable"
|-
! Country Code
! National Destination Code 
! Subscriber Number
|- style="text-align:center;"
|| 1 to 3 digits
| colspan=2 | maximum 15 digits − number of digits in the country code
|-
| colspan="3" style="text-align:center;"| maximum 15 digits
|}

===Global services===
{| class="wikitable"
|-
! Country Code
! Global Subscriber Number
|- style="text-align:center;" 
|| 3 digits   
| maximum 12 digits
|- 
| colspan="2" style="text-align:center;"| maximum 15 digits
|} 

<ref name=":0" /> Figure 2

===Networks===
{| class="wikitable"
|-
! Country Code
! Identification Code
! Subscriber Number
|- style="text-align:center;" 
|| 3 digits
|| 1 to 4 digits
|| maximum 12 digits − number of digits in the identification code
|-
| colspan="3" style="text-align:center;"| maximum 15 digits
|}

===Groups of countries===
{| class="wikitable
! Country Code
! Group Identification Code
! Subscriber Number
|- style="text-align:center;" 
|| 3 digits
|| 1 digit
|| maximum 11 digits
|-
| colspan="3" style="text-align:center;"| maximum 15 digits
|}

===Trials===
{| class="wikitable"
|-
! Fixed code
! Trial Identification Code
! Subscriber Number
|- style="text-align:center;" 
|| 991
|| 1 digit
|| maximum 11 digits
|-
| colspan="3" style="text-align:center;"| maximum 15 digits
|}