Download numbering data
Cyhoeddwyd: 13 Mawrth 2024
Diweddarwyd diwethaf: 15 Ionawr 2025
We publish data on which UK telephone numbers are available for allocation or are allocated, and lists of codes for use in number porting and other administrative tasks.
Guidance on the provision of Calling Line Identification facilities and other related services
Cyhoeddwyd: 26 Ebrill 2018
Diweddarwyd diwethaf: 31 Hydref 2024
Guidelines for the provision of Calling Line Identification Facilities and other related services over Electronic Communications Networks Version 2
Dyfodol rhifau ffôn - Datganiad ar rannu refeniw
Cyhoeddwyd: 1 Rhagfyr 2023
Diweddarwyd diwethaf: 11 Hydref 2024
Mae’r ymgynghoriad hwn yn rhan o’n hadolygiad parhaus o rifau ffôn (Adolygiad Dyfodol Rhifau).
Telecoms numbering
Cyhoeddwyd: 28 Ebrill 2010
Diweddarwyd diwethaf: 11 Hydref 2024
This section provides information about UK telephone numbers, and allows communications providers to apply for telephone numbers from the National Numbering Plan.
Canllaw i gostau galwadau
Cyhoeddwyd: 14 Chwefror 2023
Diweddarwyd diwethaf: 8 Awst 2023
Dysgwch faint mae’n ei gostio i ffonio rhifau gwahanol.
Diogelu blychau ffôn hanfodol
Cyhoeddwyd: 8 Awst 2023
Gall blychau ffôn cyhoeddus ddarparu rhwyd ddiogelwch i bobl heb fynediad at linell dir neu ffôn symudol sy'n gweithio. O dan reolau Ofcom, mae miloedd o flychau ffôn hanfodol wedi'u diogelu rhag cael eu dileu.
Enforcement programme into compliance with annual geographic number charges
Cyhoeddwyd: 23 Chwefror 2015
Diweddarwyd diwethaf: 19 Gorffennaf 2023
This programme assessed CPs compliance with their requirements to pay Ofcom an annual charge for ‘specified’ geographic numbers.
Rhifau ffôn ar gyfer eu defnyddio mewn dramâu teledu a radio
Cyhoeddwyd: 26 Hydref 2004
Diweddarwyd diwethaf: 11 Mai 2023
Ofcom continues to receive requests for Geographic Numbers to be used for drama purposes. In light of this, Ofcom has set out below a range of Geographic Telephone Numbers recommended for drama purposes (1000 numbers within each Geographic Area Code).
Consultation: Calling Line Identification (CLI) authentication – a potential approach to detecting and blocking spoofed numbers
Cyhoeddwyd: 28 Ebrill 2023
we are inviting stakeholders views on our initial thinking about how CLI authentication might work in the UK
Number Portability
Cyhoeddwyd: 3 Ebrill 2023
Number portability is a regulated facility which enables subscribers to change their service provider whilst keeping their existing telephone number. Its purpose is to foster consumer choice and effective competition by enabling subscribers to switch between providers without the costs and inconvenience of changing telephone number