| Code | DEF | Operator | Use | Notes
|
| 8900-8999 | | | |
|
| 8999 | 05 | Cable & Wireless Plc | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 10 | Fibernet (UK) Ltd | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 11 | Unitel Global Communications Ltd | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 12 | BT | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 13 | Anycall Ltd | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 14 | Hutchison 3G UK Ltd | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 15 | Cable & Wireless Plc | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 16 | Eircom UK Ltd | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 17 | Telco Global Networks Limited | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 18 | Affiniti Integrated Solutions Ltd | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 19 | Tiscali UK Limited | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 2 | COLT Telecommunications | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 3&4 | Cable & Wireless Plc | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 8 | BT | Inbound Routing Codes | 10 Digit Numbers
|
| 8999 | 9 | Communications Networking Services (UK) | Inbound Routing Codes | 10 Digit Numbers
|