ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1333	1.II.2026	(Information received by 16 January 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

Approval and deletion of ITU-T Recommendations

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

Telephone Service:

Cayman Islands (Utility Regulation and Competition Office (OfReg), Grand Cayman)

Denmark (Agency for Digital Government, Copenhagen)

Guyana (Telecommunications Agency, Georgetown)

Testing Laboratories recognized by ITU

Other communication:

Serbia

Service Restrictions

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

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Issuer Identifier Numbers

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

List of ITU Carrier Codes

List of International Signalling Point Codes (ISPC)

National Numbering Plan