This page contains information about which telephone companies the various 03331 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0333 100 | Allocated | British Sky Broadcasting Limited | 03/2007 |
| 0333 101 | Allocated | Entanet International Ltd | 12/2008 |
| 0333 102 | Free | - | - |
| 0333 103 | Allocated | Cirrus Response Limited | 11/2012 |
| 0333 104 | Free | - | - |
| 0333 105 | Free | - | - |
| 0333 106 | Free | - | - |
| 0333 107 | Free | - | - |
| 0333 108 | Free | - | - |
| 0333 109 | Free | - | - |
| 0333 110 | Free | - | - |
| 0333 111 | Allocated | Invomo Ltd | 01/2008 |
| 0333 112 | Allocated | Andrews & Arnold (Numbers) Ltd | 05/2010 |
| 0333 113 | Free | - | - |
| 0333 114 | Free | - | - |
| 0333 115 | Free | - | - |
| 0333 116 | Free | - | - |
| 0333 117 | Free | - | - |
| 0333 118 | Free | - | - |
| 0333 119 | Free | - | - |
| 0333 120 | Free | - | - |
| 0333 121 | Allocated | Windsor Telecom Plc | 11/2010 |
| 0333 122 | Allocated | Affiniti Integrated Solutions Ltd | 08/2013 |
| 0333 123 | Allocated | Windsor Telecom Plc | 03/2007 |
| 0333 124 | Free | - | - |
| 0333 125 | Free | - | - |
| 0333 126 | Free | - | - |
| 0333 127 | Free | - | - |
| 0333 128 | Free | - | - |
| 0333 129 | Free | - | - |
| 0333 130 | Allocated | Affiniti Integrated Solutions Ltd | 06/2014 |
| 0333 131 | Allocated | Business Broadcast Communications Ltd | 10/2009 |
| 0333 132 | Free | - | - |
| 0333 133 | Allocated | IV Response Limited | 05/2007 |
| 0333 134 | Free | - | - |
| 0333 135 | Free | - | - |
| 0333 136 | Allocated | Magnetic North Software Limited | 06/2009 |
| 0333 137 | Free | - | - |
| 0333 138 | Free | - | - |
| 0333 139 | Free | - | - |
| 0333 140 | Free | - | - |
| 0333 141 | Free | - | - |
| 0333 142 | Free | - | - |
| 0333 143 | Free | - | - |
| 0333 144 | Free | - | - |
| 0333 145 | Free | - | - |
| 0333 146 | Free | - | - |
| 0333 147 | Free | - | - |
| 0333 148 | Free | - | - |
| 0333 149 | Free | - | - |
| 0333 150 | Allocated | Red Matter Limited | 05/2010 |
| 0333 151 | Free | - | - |
| 0333 152 | Free | - | - |
| 0333 153 | Free | - | - |
| 0333 154 | Free | - | - |
| 0333 155 | Protected | - | - |
| 0333 156 | Free | - | - |
| 0333 157 | Free | - | - |
| 0333 158 | Free | - | - |
| 0333 159 | Free | - | - |
| 0333 160 | Free | - | - |
| 0333 161 | Free | - | - |
| 0333 162 | Free | - | - |
| 0333 163 | Free | - | - |
| 0333 164 | Free | - | - |
| 0333 165 | Free | - | - |
| 0333 166 | Free | - | - |
| 0333 167 | Free | - | - |
| 0333 168 | Free | - | - |
| 0333 169 | Free | - | - |
| 0333 170 | Free | - | - |
| 0333 171 | Free | - | - |
| 0333 172 | Free | - | - |
| 0333 173 | Free | - | - |
| 0333 174 | Free | - | - |
| 0333 175 | Free | - | - |
| 0333 176 | Free | - | - |
| 0333 177 | Free | - | - |
| 0333 178 | Free | - | - |
| 0333 179 | Free | - | - |
| 0333 180 | Free | - | - |
| 0333 181 | Free | - | - |
| 0333 182 | Free | - | - |
| 0333 183 | Free | - | - |
| 0333 184 | Free | - | - |
| 0333 185 | Free | - | - |
| 0333 186 | Free | - | - |
| 0333 187 | Free | - | - |
| 0333 188 | Free | - | - |
| 0333 189 | Free | - | - |
| 0333 190 | Free | - | - |
| 0333 191 | Free | - | - |
| 0333 192 | Free | - | - |
| 0333 193 | Free | - | - |
| 0333 194 | Free | - | - |
| 0333 195 | Free | - | - |
| 0333 196 | Free | - | - |
| 0333 197 | Free | - | - |
| 0333 198 | Free | - | - |
| 0333 199 | Free | - | - |