Number range
0300 777 xxxx
Ofcom’s records for the block of 10,000 numbers that start 0300777, and any numbers in it that we hold other information about.
What Ofcom’s records say
- Allocated to
- Windsor Telecom Limited
- The provider Ofcom gave the block to
- Ofcom status
- Allocated
- Allocated on
- 26 June 2008
- Area
- Not linked to a place
- 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 Windsor Telecom 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.
- 0300 777 0002
- NHS trust service or site: Urgent Community Response Northamptonshire Non-Medical Prescribers
- 0300 777 7878
- Government organisation: Air Accidents Investigation Branch
- Government organisation: Marine Accident Investigation Branch
Contains public sector information from NHS England (Organisation Data Service), "NHS Trust Sites (ets)" (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.