| Code | Type | Status | Function | Communications Provider | Sub-Allocatee | Trading Name | Name of Service | Description of Service | Use | Change |
| 150 | C | Designated | Manx Telecom | Customer Access (Installation Service) | ||||||
| 150 | C | Designated | Orange; C&W; Kingston Comms | Customer Services | 03/1997 | |||||
| 150 | C | Designated | Telewest Communications Plc | Residential Enquiries | ||||||
| 150 | C | Designated | Thus; Telstra; Telewest Communications; C&W; | Residential Customer Service | 03/1997 | |||||
| 150 | C | Designated | BT; Telewest Communications Plc | PC Sales and Billing | ||||||
| 1500 | C | Designated | C&W | Internal | ||||||
| 1501 | C | Designated | C&W | Internal | 09/1996 | |||||
| 1505 | C | Designated | C&W | Internal | 09/1996 | |||||
| 1509 | C | Designated | C&W | Internet Technical Support | 05/1999 | |||||
| 151 | C | Designated | Manx Telecom | Customer Access (Repair Service) | ||||||
| 151 | C | Designated | Cable and Wireless Guernsey Limited | Fault report | 03/1997 | |||||
| 151 | C | Designated | C&W | Customer Services | ||||||
| 151 | C | Designated | Jersey Telecom | Fault Reports | ||||||
| 151 | C | Designated | Thus Plc | Residential Fault Reports | 03/1997 | |||||
| 151 | C | Designated | Vodafone Ltd | |||||||
| 151 | C | Designated | C&W Jersey Ltd | Faults | ||||||
| 151 | C | Designated | BT; Telewest Communications Plc | PC Fault Reporting | ||||||
| 152 | C | Designated | BT; Telewest Communications; TCC | BC Sales and Billing | ||||||
| 152 | C | Designated | Thus; Telstra; Telewest Communications; C&W; | Business Customer Service | 03/1997 | |||||
| 152 | C | Designated | Manx Telecom | Information Services | ||||||
| 152 | C | Designated | Jersey Telecom | GSM Fault Reports | ||||||
| 152 | C | Designated | Vodafone Ltd | Refer to Operator | ||||||
| 152 | C | Designated | Orange | Billing Enquiries | ||||||
| 152 | C | Designated | C&W | Customer Services | ||||||
| 153 | A | Designated | Message Advising International Directory Enquiries Change | BT; Telewest Communications Plc; Kingston Communications (Hull) Plc; C&W; T-Mobile (UK) Limited; ntl Group Ltd; Energis; Orange; Manx Telecom; Cable and Wireless Guernsey Limited; Thus Limited; COLT; Jersey Telecom; Reach Europe Ltd | International Directory Enquiries | |||||
| 154 | C | Designated | Reach Europe Ltd; Telewest Communications; ntl Group Ltd; C&W; Kingston Comms | Business Faults | 03/1997 | |||||
| 154 | C | Designated | T-Mobile (UK) Limited | Fault Report for Other Networks | ||||||
| 154 | C | Designated | O2 (UK) Limited | BT Network Faults | ||||||
| 154 | C | Designated | Manx Telecom | Customer Access (Mobile Service) | ||||||
| 154 | C | Designated | Vodafone Ltd | Refer to Operator | ||||||
| 154 | C | Designated | Jersey Telecom | BC Fault Reporting | ||||||
| 154 | C | Designated | C&W | Customer Services | ||||||
| 155 | A | Designated | International Assistance Operator | BT; Telewest Communications; C&W; ntl Group Ltd; Cable and Wireless Guernsey Limited; T-Mobile (UK) Limited; Energis; Orange; Manx Telecom; Thus Limited; COLT; Jersey Telecom; Reach Europe Ltd | International Assistance Operator | |||||
| 156 | C | Designated | ntl Group Ltd | Credit Control | 03/1997 | |||||
| 156 | C | Designated | C&W | Refer to Operator | 09/1995 | |||||
| 156 | C | Designated | Orange | Refer to Operator | 07/1995 | |||||
| 156 | C | Designated | Manx Telecom | Customer Access (Exchange Engineer) | ||||||
| 156 | C | Designated | Vodafone Ltd | Refer to Operator | ||||||
| 157 | C | Designated | Orange | Future International DQ Call Connect | ||||||
| 157 | C | Designated | Manx Telecom | Customer Access (Internet Service) | ||||||
| 157 | C | Designated | ntl Group Ltd | VoiceMail | 03/1997 | |||||
| 1570 | C | Designated | ntl Group Ltd | VoiceMail Access | 06/2007 | |||||
| 1570 | C | Designated | C&W | Internal Use | 08/1995 | |||||
| 1571 | C | Designated | Manx Telecom | Voicemail Access | 06/2004 | |||||
| 1571 | C | Designated | C&W | Internal Use | 11/1995 | |||||
| 1571 | C | Designated | BT | Call Minder | 09/1995 | |||||
| 1571 | C | Designated | ntl Group Ltd | VoiceMail Access | 03/1997 | |||||
| 1571 | C | Designated | C&W | Voice Mail Access | 12/1996 | |||||
| 1571 | C | Designated | C&W | Internal Use | 08/1995 | |||||
| 1571 | C | Designated | Kingston Communications | N/W wide message retrieval from customer home phon | ||||||
| 1572 | C | Designated | Kingston Communications | Message retrieval from own phone (no menu) | ||||||
| 1572 | C | Designated | C&W | Internal Use | 08/1995 | |||||
| 1576 | C | Designated | C&W | Internal Use | 01/1996 | |||||
| 1576 | C | Designated | Kingston Communications | Message deposit and customer remote access | ||||||
| 1579 | C | Designated | ntl Group Ltd | VoiceMail | 03/1997 | |||||
| 158 | C | Designated | Manx Telecom | Information Services | ||||||
| 159 | C | Designated | ntl Group Ltd | Reminder Call (Nottingham) | 03/1997 | |||||
| 159 | C | Designated | Jersey Telecom | Service Centre Access | ||||||
| 159 | C | Designated | Manx Telecom | Prepaid Mobile Re-charge Services | ||||||
| 159 | C | Designated | ntl Group Ltd | Customer Service Movie Upgrade | 01/1997 | |||||
| 159 | C | Designated | C&W | Pay Per View Hotline | 09/1996 |
