ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1336	15.III.2026	(Information received by 27 February 2026)   ISSN 1564-5223 (Online)
Place des Nations CH-1211 Genève 20 (Switzerland) Tel:            +41 22 730 5111 E-mail:       itumail@itu.int		Standardization Bureau (TSB) Tel:            +41 22 730 5211 Fax:            +41 22 730 5853 E-mail:       tsbmail@itu.int / tsbtson@itu.int	Radiocommunication Bureau (BR) Tel:            +41 22 730 5560 Fax:            +41 22 730 5785 E-mail:       brmail@itu.int

Table of Contents

GENERAL  INFORMATION

Lists annexed to the ITU Operational Bulletin: Note from TSB.... 3

Approval and deletion of ITU-T Recommendations

The International Public Telecommunication Numbering Plan: Note from TSB

International Identification Plan for Public Networks and Subscriptions: Note from TSB

Telephone Service:

Azerbaijan (Ministry of Digital Development and Transport, Baku)

Guyana (Telecommunications Agency, Georgetown)

Service Restrictions.. 18

Call-Back and alternative calling procedures (Res. 21 Rev. PP-06).. 18

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Recommendation ITU-T E.164 assigned Country Codes

Mobile Network Codes (MNC) for the international identification plan for public networks
and subscriptions.. 20

List of ITU Carrier Codes

List of International Signalling Point Codes (ISPC).. 22

National Numbering Plan.... 22