Note that this list only contains the names and addresses of operators that curently have tariffs featured in this comparison. Many operators have multiple offices, only the head office is shown here.
Some operators offer only
residential services, others only business services, some both.
These are generally distinguished in this list by the appearance
of a residential or business services telephone number.
| Company Name | Address | General Phone | Residential Services | Business Services | Fax |
| 123 Telecom Ltd | 305-308 Vale Enterprise Park, Hayes Road, Sully, Cardiff CF64 5SY | 0870 871 0123 | 0870 871 0123 | 0870 871 0124 | |
| 18185/Finarea SA | Viale Carlo Cattaneo 1, Lugano 6900, Switzerland | +41 91 922 5431 | +41 91 922 5433 | ||
| 1899/Finarea SA | PO Box 45574, London NW1 3YL | 0808 170 1899 | 0808 170 1899 | ||
| 4tel Communications | 1st Floor, Carrick Business Centre, Commercial Road, Penryn, Cornwall TR10 8AR | 0870 750 6300 | 0800 505 3210 | 0870 750 6301 | |
| ACN European Services Ltd | PO Box 66, Hounslow TW5 9RT | 0800 331 6007 | |||
| Adept Telecom | 1st Floor, 27 Mount Ephraim, Tunbridge Wells TN4 8BS | 0870 190 9100 | 0870 190 9101 | ||
| Alpha International Overseas Telecommunications Services Ltd | 7th Floor, Regal House, 70 London Road, Twickenham TW1 3QS | 020 7892 3660 | 0845 085 0250 | ||
| Andrews & Arnold Ltd | Enterprise Court, Downmill Road, Bracknell RG12 1QS | 01344 400000 | 03333 400999 | 03333 400999 | 01344 400001 |
| AOL Europe Services Sàrl | 65 boulevard Grande-Duchesse Charlotte, L-1331 Luxembourg | 0800 200 6200 | 0800 200 6200 | ||
| Axis Telecom Ltd | Europa House, Ferensway, Kingston upon Hull HU1 3UT | 0845 373 2395 | 0845 373 2395 | 0845 373 2395 | 0845 373 2396 |
| Band Telecom Ltd | Eden House, Enterprise Way, Edenbridge, Kent TN8 6HF | 020 7099 1310 | 020 7099 1311 | ||
| Barablu | 58 Marsh Wall, Regatta House, London E14 9TP | 020 7170 0400 | 020 7170 0435 | ||
| Betamax GmbH & Co KG | Im Mediapark 8, D-50670 Köln, Germany | +49 221 3549565 | +49 221 3549565 | +49 221 3549566 | |
| Breathe Talk | PO Box 3021, Gloucester GL2 4ZR | 0845 366 1640 | |||
| British Telecommunications PLC | 81 Newgate Street, London, EC1A 7AJ | 020 7356 5000 | 0800 800150 | 0800 800152 | |
| Bulldog Communications Ltd | 40 Portman Square, London W1H 6LT | 0800 056 6745 | 0800 404 8151 | 0800 404 8151 | |
| Call Telecom | |||||
| Call Union | 155 Commercial Street, London E1 6BJ | ||||
| Call118866/Finarea SA | PO Box 44714, London SW1Y 4XD | 0844 861 8040 | 0844 861 8040 | ||
| Callax Telecom Ltd | Level 3, Tower 42, 25 Old Broad Strret, London EC2N 1HN | 020 7877 0432 | 020 7877 0708 | ||
| Callserve Communications Ltd | 2 Harbour Exchange Square, London E14 9GE | 020 7517 7100 | 020 7517 7101 | ||
| Care Telecom Ltd | 30 Churchill Square, Kings Hill, Kent ME19 4YU | 0845 362 0020 | 0845 362 0020 | 0845 362 0021 | |
| Carphone Warehouse Business Solutions Ltd | 1st Floor Chadwick House, Birchwood Park, Warrington WA3 6AE | 0800 083 3999 | 0800 083 3003 | ||
| Carphone Warehouse PLC | North Action Business Park, Wales Farm Road, London W3 6RS | 020 8896 5000 | 0870 442 0698 | 020 8896 5005 | |
| Centrica PLC | 97 Talbot Road, Old Trafford, Manchester M16 0TW | 0800 072 1945 | 0800 316 0546 | 0800 072 1955 | |
| CheapestChat | PO Box 20338, London NW11 9ZW | 0870 041 2214 | 0870 041 2215 | ||
| Coms.Com Ltd | 77 Queen Victoria Street, London EC4V 4AY | 020 7148 3000 | 020 7148 3000 | 020 7148 3000 | 020 7148 3001 |
| Consumer First Ltd | 2 Hillmans Court, Coleraine, Co Londonderry BT52 2DF | 028 7044 7777 | 0870 870 1125 | ||
| Cyta (UK) Ltd | 56A Haverstock Hill, London NW3 2BH | 020 7428 1000 | 0800 036 0078 | 020 7428 1005 | |
| Demon | 322 Regents Park Road, London N3 2QQ | 0800 027 3737 | 0845 272 2333 | 0845 272 2333 | |
| Direct Save Telecom | Hartcran House, Gibbs Couch, Carpenders Park, Herts WD19 5EZ | 0870 050 0601 | 0800 027 3930 | 020 8428 9134 | |
| DRD Communications Ltd | Connect House, 21 Willow Lane, Mitcham, Surrey CR4 4NA | 0800 1957978 | 0800 1957978 | ||
| e-SHOP Telecom | 1200 Century Way, Thorpe Park Business Park, Colton, Leeds LS15 8ZA | 0845 330 8333 | 0845 330 8333 | 0870 755 7800 | |
| Easy-Dial | PO Box 8213, Chiswick, London W4 3WR | 020 8987 9552 | 020 8747 0382 | ||
| Eclipse Networking Ltd | 37 Carr Lane, Hull HU1 3RE | 0845 1224 111 | 0845 1224 111 | 0845 1224 111 | 01392 333 334 |
| Equitalk.co.uk Ltd | Innovation Centre, 77 Heyford Park, Upper Heyford, Oxon OX25 5HD | 0800 161 3837 | 0800 161 3837 | 01869 238096 | |
| Euphony Communications Ltd | Belvedere, Basing View, Basingstoke RG21 4HG | 01256 857000 | 01256 857000 | 01256 857000 | 01256 857103 |
| Finarea SA | Viale Carlo Cattaneo 1, Lugano 6900, Switzerland | +41 91 922 5431 | +41 91 922 5433 | ||
| First National Telecomms Services Ltd | 87 Cheapside, London EC2V 6EB | 020 7323 4909 | 0800 097 7777 | 0800 097 0800 | 020 7323 4907 |
| Focus 4U Ltd | Hove Tech Centre, St Joseph's Close, Hove East, Sussex BN3 7ES | 01273 827410 | 0845 450 2065 | 01273 827411 | |
| FreedomCall Ltd | Withypitts Farmhouse, Selsfield Road, Turners Hill. West Sussex RH10 4P | 0800 279 6050 | 0800 279 6050 | 0800 279 6050 | |
| Freetalk Communications Ltd | Foxglove House, 166 Piccadilly, London W1J 9EF | 0871 218 2180 | 0871 218 2180 | ||
| Glow Telecom | Unit 9, Hortonwood 7, Telford TF1 7YY | 0870 161 6999 | 0870 161 6999 | ||
| Gradwell Dot Com Ltd | 3-3a Gloucester Street, Bath BA1 1SE | 020 7039 0000 | 0845 003 0044 | 020 7039 0020 | |
| Highland Network Ltd | 10 Lotland Street, Inverness IV1 1PA | 0870 774 1208 | 0870 774 1209 | ||
| ICUK Computing Services Ltd | 240a Pampisford Road, South Croydon CR2 6DB | 0845 009 9175 | 0870 116 6175 | 0870 116 6175 | 0870 116 2001 |
| Inet Telecoms Ltd | Sovereign House, 227 Marsh Wall, London E14 9SD | 020 7043 5555 | 020 7043 5555 | 020 7043 5556 | |
| IV Response Ltd | 102 Cavell Street, London E1 2JA | 020 7717 1766 | 0871 755 0800 | 020 7717 1701 | |
| Jersey Telecoms | PO Box 53, No 1 The Forum, Grenville Street, St Helier, Jersey JE4 8PB | 01534 882882 | 0800 735 2500 | 0800 735 2345 | |
| Joy Telecom | PO Box 34057, London N13 5WA | ||||
| Kent Telephones Ltd | 103 Grosvenor Place, Margate, Kent CT9 1UX | 01843 232777 | 01843 220600 | ||
| Kingston Communications (Hull) PLC | Telephone House, Carr Lane, Hull, HU1 3RE | 01482 602555 | 01482 223366 | ||
| Kiss Telecom Ltd | The Coach House, Alderley Road, Wilmslow, Chesiure SK9 1QA | 0845 017 6700 | 0845 017 6701 | ||
| Lansdowne Telecom | 3 Bowood Close, Derry Hill, Calne, Wilts SN11 9QZ | 0845 241 1166 | 0845 241 1177 | 0845 241 1166 | |
| Liquid Telecommunications Ltd | 1 Kingsway, London WC2B 6XF | 020 7101 6100 | 0808 178 4212 | 020 7101 6102 | |
| Lo-Call Telecom Ltd | PO Box 4448, Worthing, West Sussex BN11 2BJ | 0845 450 0071 | 0845 450 0071 | 0845 450 0071 | |
| Localphone Ltd | 4 Paradise Street, Sheffield S1 2DF | 0114 319 1919 | 0114 319 1919 | ||
| Lycatel Ltd | Walbrook Building, 195 Marsh Wall, London E14 9SG | 020 7132 0132 | 0800 652 9189 | ||
| Magrathea Telecommunications Ltd (Telesave) | Albany House, 14 Shute End, Wokingham, Berks RG40 1BJ | 0800 066 4066 | 0800 066 4066 | 0800 066 4066 | |
| Maxtalk Ltd | 2 Hillmans Court, Coleraine, Co Londonderry BT52 2DF | 0845 174 6188 | 0845 174 6188 | 0845 174 6188 | |
| MCI WorldCom Ltd | Reading International Business Park, Basingstoke Road, Reading RG2 6DA | 0118 905 5000 | 0800 279 4585 | ||
| Media Now | |||||
| Midland Telecom | St George's Court, 255 Hospital Street, Birmingham B19 2YF | 0121 333 3488 | 0121 333 3488 | 0121 333 3298 | |
| News Optimus Ltd | 14 Flood Walk, Chelsea, London SW3 5RG | 020 7192 6800 | 0844 241 0499 | 020 7192 6801 | |
| Nildram | 1 Triangle Business Park, Stoke Mandeville, Bucks HP22 5BD | 0870 160 8600 | 0870 160 8602 | 0870 160 8602 | 0870 160 2719 |
| Nomi (White Nights Telecomunicações e Serviços Lda) | Rua 31 de Janeiro, Funchal, Madeira | 0845 604 7744 | 0845 604 7744 | ||
| Noo Mobile | |||||
| North American Gateway Ltd | 140-142 King's Cross Road, London, WC1X 9DX | 020 7575 7500 | 020 7575 7501 | ||
| OneBill Telecom Ltd | Premium House, The Esplanade, Worthing, West Sussex BN11 2BJ | 0845 241 0242 | 0845 241 0908 | 0845 241 0242 | 0845 601 4832 |
| OnePhone (UK) | |||||
| Opal Telecommunications Ltd | Northbank Industrial Park, Irlam, Manchester, M44 5BL | 0845 330 5005 | 0845 330 5008 | ||
| p2p Communications Ltd | Ashlea House, 323 North Road, Manchester M11 4NY | 0870 730 3737 | 0870 730 3737 | 0870 730 3737 | 0870 730 3722 |
| Phonecard Services Ltd | PO Box 8213, Chiswick, London W4 3WR | 020 8987 9553 | 0870 120 2033 | 020 8747 0382 | |
| Pineapple Communications | |||||
| Pipex Communications | 1 Triangle Business Park, Stoke Mandeville, Bucks HP22 5BL | 0870 094 6060 | 0845 077 2455 | 0800 031 7317 | |
| Pipex Homecall Ltd | Christie Fields, Derwent Avenue, Manchester M21 7QS | 0870 220 2112 | 0870 220 2112 | 0870 220 2113 | |
| PlusNet Plc | Technology Building, Terry Street, Sheffield, S9 2BU | 0845 140 0200 | 0845 140 0200 | 0845 140 0200 | 0870 703 8553 |
| Post Office Ltd | 148 Old Street, London EC1V 9HQ | 020 7250 2888 | 0845 722 3344 | ||
| Primus Telecommunications Ltd | Level 2, 207 Old Street, London EC1V 9NR | 020 7669 6000 | 0800 036 3839 | 0800 836 1234 | 020 7669 6100 |
| Qualicom Aspire Ltd | 188-196 St Albans Rd, Watford WD24 4NE | 0845 450 6551 | 0845 450 6551 | 0845 450 6552 | |
| QX Telecom Ltd | PO Box 6110, Newbury, Berks RG14 6ZN | 0870 119 0222 | 0870 119 0222 | ||
| RateBusters Ltd | PO Box 50324, London W4 5UA | ||||
| Resource Utilities Ltd | 3-9 Broomhill Road, London SW18 4JQ | 0870 877 0000 | |||
| Saga Services Ltd | The Saga Building, Middelburg Square, Folkestone, Kent CT20 1AZ | 0800 559 3229 | 0800 559 3229 | ||
| Sainsbury's Telecom | 1 Portal Way, London W3 6RS | 0870 990 9685 | 0870 990 9685 | ||
| Schooltel Ltd | 23 Bedfordshire Down, Warfield, Bracknell, Berks RG42 3UA | 07050 287201 | |||
| Scottish and Southern Energy PLC | PO Box 7506, Perth PH1 3QR | 0845 744 4555 | 0845 744 4555 | ||
| Simply-Fone | PO Box 20338, London NW11 9ZW | 0870 041 4333 | |||
| Sipgate (Indigo Networks GmbH) | Ronsdorfer Strasse 74 Halle 15/22, D-40233 Dusseldorf, Germany | ||||
| Skype Communications SA | PO Box 75538, Luxembourg 1070 AM, Luxembourg | ||||
| Smallworld Media Communications Ltd | 3 Chalmers Place, Irvine, North Ayrshire KA11 5DH | 01524 313131 | 0800 070 6050 | 0800 070 6050 | |
| SolwiseTelephony Ltd | Dennis House, Hawley Road, Hinckley Leics LE10 0PR | 0845 006 0800 | 0845 006 0800 | 0871 872 0866 | |
| Splash Telecom | 43 Cariocca Business Park, Hellidon Close, Manchester, M12 4AH | 0870 411 8811 | 0870 411 8811 | 0870 411 2112 | |
| Startup Ventures Ltd | Innovation House, White Road, Oxford OX4 2JJ | ||||
| Story Telecom | Britannia House, 958 High Road, London N12 9RY | 0845 108 4450 | 0845 108 4551 | ||
| SuperLine Telecommunications Ltd | 43 Charlotte Street, London EC2A 3PD | 0845 229 1461 | 0845 229 1462 | ||
| Swiftcall Ltd | PO Box 10, Belfast BT1 1BR | 0800 769 0000 | 0800 769 9999 | ||
| Swiftnet Ltd | Britannia House, 960 High Road, London N12 9RY | 020 8446 9494 | 020 8446 7010 | ||
| Talk Online Ltd | 2 Harbour Exchange Square, London E14 9GE | ||||
| TalkTalk Business | PO Box 136, Birchwood, Warrington WA3 7WU | 0800 083 3003 | 0800 083 3003 | ||
| Telappliant | Unit 40, St Olav's Court, City Business Centre, 25 Lower Road, London SE16 2XB | 020 7740 3490 | 0845 004 4040 | 0845 004 4040 | 0845 004 0401 |
| Telecom Plus PLC | Dryden House, The Edge Business Centre, Humber Road, London, NW2 6EW | 0871 222 7777 | 0871 222 7777 | 0871 222 7554 | |
| Telediscount/Finarea SA | PO Box 12516, 1100 AM Amsterdam, Netherlands | ||||
| Telestunt | PO Box 12516, 1100 AM Amsterdam, Netherlands | ||||
| Telstra Europe Ltd | 3 Finsbury Square, London EC2A 1AE | 020 7858 8800 | 0800 856 6000 | 020 7858 8801 | |
| Tesco Talk | PO Box 5879, Forres IV36 2YF | 0845 300 7080 | 0845 300 7080 | 0845 300 6030 | |
| The Phone Co-Op Ltd | 5 The Millhouse, Elmsfield Business Centre, Worcester Road, Chipping Norton, Oxon OX7 5XL | 0845 458 9000 | 0845 458 9001 | ||
| Timepiece Lda | Marina Club 3, Funchal, Madeira, Portugal | +351 29112 06000 | +351 29112 060099 | ||
| Tiscali UK | 20 Broadwick Street, London W1F 8HT | 020 7087 2000 | 0800 954 2223, 0870 741 5000 | 020 7087 2282 | |
| Toucan | PO Box 50244, London EC2V 7WZ | 0800 061 3612 | 0800 061 3615 | 0800 061 3614 | |
| Unicall Telecommunications Ltd | 31 High Street, Cobham, Surrey KT11 3DP | 01932 588866 | 0800 026 2255 | 01932 588877 | |
| Unicom | 3rd Floor, 19-21 Spring Gardens, Manchester M2 1FB | 0161 907 3788 | 0161 907 3990 | 0161 906 9000 | |
| Universal Communications (UK) Ltd | Ensign House, Admirals Way, Marsh Wall, London E14 9XQ | 020 7538 2222 | 020 7538 8388 | ||
| Uniworld Communications Ltd | Waterside House, Haslar Marine Technology park, Gosport, Hants PO12 2AU | 0845 458 4510 | 0845 458 4509 | ||
| Vanishing Point Ltd | 110 Gloucester Avenue, London NW1 8HX | 020 7722 6878 | 020 7483 4541 | ||
| VBCnet GB Ltd | Maggs House, Clifton, Bristol BS8 1QX | ||||
| Vectone Ltd | 58 Marsh Wall, Regatta House, London E14 9TP | 020 7170 0400 | 020 7170 0400 | 020 7170 0435 | |
| Ventelo Ltd | 69 Wilson Street, London EC2A 2BB | 020 7666 6000 | 020 7666 6001 | ||
| Virgin Media Ltd | Box 333, Matrix Court, Swansea SA7 9BB | 0845 454 1111 | 0845 454 1111 | 0800 953 0180 | |
| Vodafone Ltd | Vodafone House, The Connection, Newbury, Berks RG14 2FN | 01635 33251 | 0870 070 0191 | ||
| VoIP-4U Ltd | Midsummer Court, 314 Midsummer Boulevard, Central Milton Keynes MK9 2UB | 01908 764196 | 01908 764186 | ||
| Vonage | 2 Temple Back East, Temple Quay, Bristol BS1 6EG | 020 7993 9000 | 0800 008 6000 | 0800 008 6000 | |
| Welcome Telecom Ltd | G4 The Old Convent, Beeches Green, Stroud, Glous GL5 4AD | 0800 652 0853 | 0800 652 0853 | 0800 652 0854 | |
| XFone Inc | Britannia House, 960 High Road, London N12 9RY | 0870 004 4004 | 0870 041 0007 | 020 8446 7010 | |
| XLN Telecom | PO Box 42177, London SW8 1UE | 0870 777 6766 | 0870 777 6766 | 020 7793 5549 | |
| Yellow Telecoms Ltd | Dunston Innovation Centre, Dunston Road, Chesterfield S41 8NG | 0845 108 0181 | 0845 0182 | ||
| Your Communications Ltd | Hathersage Road, Chorlton-on-Medlock, Manchester M13 0EH | 0800 195 9000 | 0800 834097 | 0800 195 9001 | |
| Your Connection Ltd | St Augustines Business Centre, 125 Canterbury Road, Westgate on Sea, Kent CT8 8NL | 0845 058 0750 | 0845 058 0750 | 0845 058 0750 | 0870 201 1122 |
| Yourcalls.net | Premium House, The Esplanade, Worthing, West Sussex BN11 2BJ | 0845 450 5020 | 0845 450 5020 | 0845 601 4832 | |
| Zen Internet | Moss Bridge Road, Rochdale, Lancs OL16 5EA | 0845 058 9000 | 0845 058 9000 | 0845 058 9000 | 0845 058 9005 |
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