Number range
020 3817 xxxx
Ofcom’s records for the block of 10,000 numbers that start 0203817, and any numbers in it that we hold other information about.
What Ofcom’s records say
- Allocated to
- Gamma Telecom Holdings Limited
- The provider Ofcom gave the block to
- Ofcom status
- Allocated
- Allocated on
- 6 October 2014
- Numbers in block
- 10,000 numbers
- Number length
- 11 digits
Source: Ofcom numbering data, files published 7 October 2026, checked 13 October 2026
Ofcom has allocated this block of numbers to Gamma Telecom Holdings Limited.
Ofcom allocates phone numbers to communications providers in blocks. The provider shown is the one Ofcom allocated this block to. It is not the person or business that called you, and the number may since have moved to a different network, because people can usually keep their number when they switch provider. Ofcom does not hold information about individual numbers.
Numbers in this range we know about
Numbers an organisation lists on its own website or in an official register, and numbers at least 3 visitors have reported.
- 020 3817 2000
- Government organisation: Maritime and Coastguard Agency
- Contact listed on GOV.UK: Maritime and Coastguard Agency
- 020 3817 2006
- Government organisation: Maritime and Coastguard Agency
- Contact listed on GOV.UK: The UK Beacon Registry
- 020 3817 2222
- Government organisation: Maritime and Coastguard Agency
- 020 3817 2575
- Contact listed on GOV.UK: Receiver of Wreck
- 020 3817 3975
- GP practice: The Northern Medical Centre
- 020 3817 4117
- GP practice: Highgrove Surgery
- 020 3817 4431
- GP practice: Partnership Primary Care Centre
Contains public sector information from NHS England (Organisation Data Service), "GP Practices (epraccur)" (13 October 2026), licensed under the Open Government Licence v3.0.
Sources and checks
This page relies on:
Checked on 13 October 2026. Read how reports work. How we check our information. Spotted a mistake? Tell us and we will put it right.