ITU Operational Bulletin www.itu.int/itu-t/bulletin
No. 1311	1.III.2025	(Information received by 14 February 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:

Micronesia (Telecommunications Regulation Authority (TRA), Pohnpei) 5

Other communication:

Austria

Service Restrictions.. 7

Call-Back and alternative calling procedures (Res. 21 Rev. PP-06).. 7

AMENDMENTS  TO  SERVICE  PUBLICATIONS

List of Issuer Identifier Numbers

Mobile Network Codes (MNC) for the international identification plan  for public networks
and subscriptions. 9

List of ITU Carrier Codes

National Numbering Plan