ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1319	1.VII.2025	(Information received by 18 June 2025)   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 of ITU-T Recommendations

Telephone Service:

Guyana (Telecommunications Agency, Georgetown)

Service Restrictions.. 9

Call-Back and alternative calling procedures (Res. 21 Rev. PP-06).. 9

AMENDMENTS  TO  SERVICE  PUBLICATIONS

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

List of ITU Carrier Codes

National Numbering Plan