Permanent Carrier Pre-Selection is now available from BT, which means that's smartboxes and indirect access codes may be ignored because an Other Licensed Operator can now arrange with BT for all local, national, international NTS, mobile, page and personal calls to be 'diverted' without needing to dial any extra codes (different types of call may be routed to different OLOs) . If CPS is set-up, indirect codes may still be dialled to use alternate operators or to use BT (code 1280).
CPS can be supplied on single or multiline PSTN or ISDN lines.
This list is compiled from information published by Ofcom and has not been checked by Magenta Systems.
A CPS guide is available from Ofcom.
| Operators licensed for CPS | Operators licensed for CPS | Operators licensed for CPS |
| 2Communications Ltd | Internet Telecommunications Plc | Spitfire Network Services Ltd |
| 4COST Ltd | Interweb Design Ltd | Starcomm Ltd |
| Affiniti Integrated Solutions Ltd | Invomo Ltd | Stardex (UK) Ltd |
| Aggregated Telecom Ltd | KCOM Group PLC | Startec Global Communications UK Ltd |
| Anycall Ltd | KDDI Europe Ltd | Sun Telecommunications Europe Ltd |
| Atlas Interactive Group Ltd | Keycom plc | Surelink Ltd |
| BT | LTT PLC | Swiftcall Ltd |
| Buzz Networks Ltd | Lycatel Services Ltd | Swiftnet Ltd |
| Cable & Wireless Plc | Madhouse Communications Ltd | Syntec UK Ltd |
| Cable and Wireless (Energis) | Magrathea Telecommunications Ltd | T-Liaison Ltd |
| Centrica Telecommunications | Medius Networks Ltd | T-Systems Ltd |
| Cheers International Sales Ltd | Modus Telecom Ltd | Talk Telecom Ltd |
| COLT Telecommunications | Nationwide Telephone Assistance Ltd | Telco Global Networks Ltd |
| Connect Telecom UK Ltd | Net Solutions Europe Ltd | Tele2 UK Services Ltd |
| Content Guru Ltd | Networks Direct plc | Teleasp.Net Ltd |
| Coralbridge Ltd | Newtel Ltd | Telecom (GB) Ltd |
| Corex Networks Ltd | Nexus Telecommunications plc | Teledesign plc |
| Direct Telephone Services Ltd | ntl Group Ltd | Teleglobe International Ltd |
| Easynet Group Plc | O2 (UK) Ltd | Telewest Communications Plc |
| Eircom UK Ltd | Opal Telecom Ltd | Telstra Europe |
| Eurobell (Holdings) plc | Opera Telecom | Thus Plc |
| Faultbasic Ltd | Oriant Telecom Ltd | Tiscali UK Ltd |
| Frontier Systems Ltd | Peerex Ltd | TRA (UK) LTD |
| Fused Networks Ltd | Pineapple Communications Ltd | Use Your Noodle Ltd |
| Gamma Telecom Holdings Ltd | Pipemedia Ltd | VC World Ltd |
| General Telephone & Telegraph Ltd | Pipex Communications PLC | Vectone Network Ltd |
| Global Crossing (UK) Ltd | Power Internet Ltd | Verizon UK Ltd |
| Global Electroteks Ltd | Premier Voicemail Ltd | Vibe Communications Uk Ltd |
| Global One Communications Holding Ltd | Primus Telecommunications | Video Networks Ltd |
| Gold Telecom Ltd | Ready Technology Ltd | VIP.Com PLC |
| HighSpeed Office Ltd | Redstone Communications Ltd | Vital Phone Ltd |
| I Communicate Services Ltd | Ringmaster Ltd | Viva Telecom |
| iBasis Europe Ltd | Ringtrue Solutions Ltd | Wavecrest (UK) Ltd |
| IDT Global Ltd | Sigma Voice Solutions Ltd | Wight Cable 2005 Ltd |
| Inclarity plc | SingTel (Europe) Ltd | Wightcable North Ltd |
| InTechnology Plc | Skymaker Ltd | Wire9 Telecom PLC |
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