This page contains information about which telephone companies the various 03700 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0370 000 | Allocated | Level 3 Communications UK Limited | 04/2007 |
| 0370 001 | Allocated | Level 3 Communications UK Limited | 04/2007 |
| 0370 002 | Protected | - | - |
| 0370 003 | Protected | - | - |
| 0370 004 | Protected | - | - |
| 0370 005 | Allocated | IV Response Limited | 05/2007 |
| 0370 006 | Protected | - | - |
| 0370 007 | Protected | - | - |
| 0370 008 | Protected | - | - |
| 0370 009 | Protected | - | - |
| 0370 010 | Allocated | Vodafone Ltd (C&W) | 03/2010 |
| 0370 011 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 012 | Allocated | Virgin Media Limited | 01/2008 |
| 0370 013 | Allocated | Virgin Media Limited | 07/2008 |
| 0370 014 | Protected | - | - |
| 0370 015 | Allocated | Virgin Media Limited | 07/2008 |
| 0370 016 | Allocated | Virgin Media Limited | 07/2008 |
| 0370 017 | Allocated | InTechnology Plc | 06/2007 |
| 0370 018 | Protected | - | - |
| 0370 019 | Protected | - | - |
| 0370 020 | Allocated | Invomo Ltd | 10/2007 |
| 0370 021 | Protected | - | - |
| 0370 022 | Protected | - | - |
| 0370 023 | Protected | - | - |
| 0370 024 | Allocated | Vodafone Ltd (C&W) | 03/2010 |
| 0370 025 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 026 | Allocated | Orange Business Holdings UK Limited | 02/2008 |
| 0370 027 | Allocated | Syntec Limited | 06/2007 |
| 0370 028 | Protected | - | - |
| 0370 029 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 030 | Protected | - | - |
| 0370 031 | Protected | - | - |
| 0370 032 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 033 | Allocated | Six Degrees Unified Comms Limited | 07/2009 |
| 0370 034 | Allocated | Gamma Telecom Holdings Ltd | 02/2008 |
| 0370 035 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 036 | Withdrawn | - | - |
| 0370 037 | Protected | - | - |
| 0370 038 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 039 | Protected | - | - |
| 0370 040 | Allocated | Virgin Media Limited | 07/2008 |
| 0370 041 | Allocated | Swiftnet Ltd | 09/2007 |
| 0370 042 | Allocated | Telecoms World Plc | 10/2007 |
| 0370 043 | Allocated | Virgin Media Wholesale Limited | 10/2009 |
| 0370 044 | Allocated | Admiral Telecom Limited | 11/2007 |
| 0370 045 | Protected | - | - |
| 0370 046 | Allocated | Oxygen8 Communications UK Limited | 01/2008 |
| 0370 047 | Allocated | Citrus Telecommunications Ltd | 11/2013 |
| 0370 048 | Allocated | Verizon UK Ltd | 04/2007 |
| 0370 049 | Allocated | Verizon UK Ltd | 04/2007 |
| 0370 050 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 051 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 052 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 053 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 054 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 055 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 056 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 057 | Protected | - | - |
| 0370 058 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 059 | Protected | - | - |
| 0370 060 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0370 061 | Allocated | Alphatalk Ltd | 03/2009 |
| 0370 062 | Allocated | Oxygen8 Communications UK Limited | 01/2008 |
| 0370 063 | Allocated | Affiniti Integrated Solutions Ltd | 07/2013 |
| 0370 064 | Allocated | TelXL Ltd | 04/2014 |
| 0370 065 | Allocated | Content Guru Ltd | 04/2014 |
| 0370 066 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 067 | Allocated | TelXL Ltd | 08/2008 |
| 0370 068 | Allocated | Magrathea Telecommunications Limited | 11/2007 |
| 0370 069 | Allocated | Invomo Ltd | 10/2007 |
| 0370 070 | Protected | - | - |
| 0370 071 | Protected | - | - |
| 0370 072 | Protected | - | - |
| 0370 073 | Protected | - | - |
| 0370 074 | Protected | - | - |
| 0370 075 | Protected | - | - |
| 0370 076 | Protected | - | - |
| 0370 077 | Protected | - | - |
| 0370 078 | Protected | - | - |
| 0370 079 | Protected | - | - |
| 0370 080 | Allocated | Invomo Ltd | 10/2007 |
| 0370 081 | Protected | - | - |
| 0370 082 | Allocated | Nexus Telecommunications Limited | 07/2007 |
| 0370 083 | Protected | - | - |
| 0370 084 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 085 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 086 | Allocated | Vodafone Ltd (Thus) | 04/2007 |
| 0370 087 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0370 088 | Allocated | Invomo Ltd | 10/2007 |
| 0370 089 | Protected | - | - |
| 0370 090 | Allocated | BT | 04/2007 |
| 0370 091 | Protected | - | - |
| 0370 092 | Allocated | Vodafone Ltd (Thus) | 01/2012 |
| 0370 093 | Allocated | 24 Seven Communications Ltd | 10/2011 |
| 0370 094 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0370 095 | Protected | - | - |
| 0370 096 | Allocated | Invomo Ltd | 10/2007 |
| 0370 097 | Allocated | InTechnology Plc | 06/2007 |
| 0370 098 | Protected | - | - |
| 0370 099 | Allocated | COLT Technology Services | 04/2007 |