This page contains information about which telephone companies the various 03000 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0300 000 | Allocated | TelNG Limited | 03/2007 |
| 0300 001 | Allocated | Hello Telecom (UK) PLC | 04/2009 |
| 0300 002 | Allocated | DRD Communications Limited | 07/2009 |
| 0300 003 | Allocated | Daisy Communications Ltd | 12/2010 |
| 0300 004 | Allocated | TalkTalk Communications Limited | 10/2009 |
| 0300 005 | Allocated | NBCN Networks Ltd | 01/2010 |
| 0300 006 | Allocated | Resilient Networks Plc | 08/2010 |
| 0300 007 | Allocated | Rhema Telecom | 03/2007 |
| 0300 008 | Allocated | Numbers Plus Ltd | 07/2011 |
| 0300 009 | Allocated | Phone Co-Op Numbering Limited | 02/2012 |
| 0300 010 | Allocated | Vodafone Ltd (C&W) | 12/2009 |
| 0300 011 | Allocated | Number Solutions Ltd | 03/2007 |
| 0300 012 | Allocated | Windsor Telecom Plc | 03/2007 |
| 0300 013 | Allocated | BT | 03/2009 |
| 0300 014 | Allocated | Liquid 11 Limited | 07/2011 |
| 0300 015 | Free | - | - |
| 0300 016 | Free | - | - |
| 0300 017 | Free | - | - |
| 0300 018 | Free | - | - |
| 0300 019 | Free | - | - |
| 0300 020 | Allocated | Vodafone Ltd (C&W) | 03/2010 |
| 0300 021 | Free | - | - |
| 0300 022 | Allocated | Tuxtel Ltd | 09/2010 |
| 0300 023 | Allocated | TalkTalk Communications Limited | 05/2009 |
| 0300 024 | Allocated | Vodafone Ltd (C&W) | 08/2008 |
| 0300 025 | Allocated | BT | 08/2013 |
| 0300 026 | Allocated | Wavenet UK Ltd | 09/2010 |
| 0300 027 | Free | - | - |
| 0300 028 | Allocated | Wavenet UK Ltd | 12/2010 |
| 0300 029 | Allocated | Virgin Media Limited | 10/2007 |
| 0300 030 | Allocated | TTNC Limited | 03/2007 |
| 0300 031 | Allocated | Square Systems Limited | 11/2008 |
| 0300 032 | Allocated | Tabsoft Limited | 03/2014 |
| 0300 033 | Allocated | Sesui Limited | 03/2007 |
| 0300 034 | Allocated | TelXL Ltd | 04/2011 |
| 0300 035 | Allocated | Danemere Street Creative | 07/2009 |
| 0300 036 | Allocated | IPPlus (UK) Limited | 04/2014 |
| 0300 037 | Allocated | Performance Telecom Limited | 12/2013 |
| 0300 038 | Free | - | - |
| 0300 039 | Free | - | - |
| 0300 040 | Allocated | Andrews & Arnold Ltd | 07/2007 |
| 0300 041 | Allocated | Level 3 Communications UK Limited | 01/2012 |
| 0300 042 | Allocated | Level 3 Communications UK Limited | 01/2012 |
| 0300 043 | Free | - | - |
| 0300 044 | Allocated | Tuxtel Ltd | 09/2010 |
| 0300 045 | Allocated | Six Degrees Unified Comms Limited | 03/2007 |
| 0300 046 | Free | - | - |
| 0300 047 | Allocated | Level 3 Communications UK Limited | 02/2010 |
| 0300 048 | Allocated | Level 3 Communications UK Limited | 02/2010 |
| 0300 049 | Allocated | Level 3 Communications UK Limited | 02/2010 |
| 0300 050 | Allocated | Level 3 Communications UK Limited | 02/2008 |
| 0300 051 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 052 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 053 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 054 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 055 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 056 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 057 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 058 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 059 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 060 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 061 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 062 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 063 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 064 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 065 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 066 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 067 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 068 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 069 | Allocated | Level 3 Communications UK Limited | 06/2007 |
| 0300 070 | Allocated | Swiftnet Ltd | 09/2007 |
| 0300 071 | Free | - | - |
| 0300 072 | Free | - | - |
| 0300 073 | Free | - | - |
| 0300 074 | Free | - | - |
| 0300 075 | Allocated | Aloha Telecommunications Limited | 07/2012 |
| 0300 076 | Free | - | - |
| 0300 077 | Allocated | Radius Communications Limited | 02/2014 |
| 0300 078 | Free | - | - |
| 0300 079 | Free | - | - |
| 0300 080 | Allocated | (aq) Limited trading as aql | 08/2007 |
| 0300 081 | Allocated | Ziron (UK) Ltd | 08/2012 |
| 0300 082 | Free | - | - |
| 0300 083 | Allocated | Virgin Media Limited | 09/2007 |
| 0300 084 | Free | - | - |
| 0300 085 | Free | - | - |
| 0300 086 | Free | - | - |
| 0300 087 | Free | - | - |
| 0300 088 | Allocated | Barritec Limited | 03/2007 |
| 0300 089 | Free | - | - |
| 0300 090 | Allocated | 360CRM Ltd | 10/2011 |
| 0300 091 | Free | - | - |
| 0300 092 | Free | - | - |
| 0300 093 | Free | - | - |
| 0300 094 | Free | - | - |
| 0300 095 | Free | - | - |
| 0300 096 | Free | - | - |
| 0300 097 | Free | - | - |
| 0300 098 | Free | - | - |
| 0300 099 | Allocated | Windsor Telecom Plc | 03/2007 |