The following is the list in detail for Mobile service operators which are mentioned against each area wise in India 
1. AndhraPradesh. 
1. Idea Cellular Ltd. 2. Bharti Airtel Ltd.(Earlier Bharti Mobile Ltd.) 3. BSNL 4. Vodafone Essar South Ltd.(Earlier Hutchison Essar South Ltd.) 5. Reliance Infocomm Ltd / Reliance Communication Ltd. 6. Tata Teleservices Ltd. 7. Aircell Ltd. 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Unitech Wireless(South) Pvt. Ltd. 11. Datacom Solutions Pvt. Ltd. 12. Etisalat DBTelecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 

2. Assam. 
1. Reliance Telecom Limited 2. BSNL 3. Bharti Airtel Ltd.(Earlier Bharti Tele-Ventures Ltd.) 4. Dishnet Wireless Ltd.(EarlierDishnetDWLLtd.) 5. Vodafone Essar Spacetel Ltd. 6. Aircell Ltd. 7. Tata Teleservices Ltd. 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Idea Cellular Ltd. 10. Loop Telecom Pvt.Ltd. 11. Videocon Telecommunications Ltd.(EarlierDatacomSolutionsPvt.Ltd.) 13. STel Pvt.Ltd. 14. Unitech Wireless(East) Pvt. Ltd.
3. Bihar including Jharkhand. 
1. Reliance Telecom Limited 2. BSNL 3. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 4. Reliance Infocomm Limited 5. Tata Teleservices Ltd. 6. Dishnet Wireless Ltd. (Earlier Dishnet DWL Ltd.) 7. Aditya Birla Telecom Ltd.(Idea) 8. Vodafone Essar Spacetel Ltd.(Earlier Essar Spacetel Ltd.) 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 10. Loop Telecom Pvt. Ltd. 11. Datacom Solutions Pvt. Ltd. 12. Unitech Wireless(East) Pvt. Ltd. 13. Allianz Infratech Pvt. Ltd. 14. STel Pvt. Ltd. 

4. Chennai. 
1. Aircel Cellular Ltd.(Earlier RPG Cellular Services Ltd.) 2. Bharti Airtel Ltd. (Earlier Bharti Cellular Ltd.) 3. BSNL 4. Vodafone Essar South Ltd.(Earlier Hutchison Essar South Ltd.) 5. Reliance Infocomm Ltd. 6. Tata Teleservices Ltd. 7. Idea Cellular Ltd. 8. Videocon Telecommunications Ltd. 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 

5. Delhi. 
1. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 2. Vodafone Essar Mobile Services Ltd.(Earlier Hutchison Essar Telecom Ltd.) 3. MTNL 4. Idea Cellular Ltd. 5. Reliance Infocomm Ltd. / Reliance Communications Ltd. 6. Tata Teleservices Ltd. 7. Aircell Ltd. 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Datacom Solutions Pvt. Ltd. 11. Etisalat DBTelecom Pvt. Ltd. (Earlier Swan Telecom Pvt. Ltd.) 12. Unitech Wireless (Delhi) Pvt. Ltd. 

6. Gujarat. 
1. FASCEL Ltd. 2. Idea Cellular Ltd. 3. BSNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Limited / RelianceCommunicationsLtd. 6. TataTeleservices Ltd. 7. Aircell Ltd. 8. Vodafone Essar Gujarat Ltd. 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 10. Loop Telecom Pvt. Ltd. 11. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 12. Etisalat DB Telecom Pvt. Ltd. (Earlier Swan Telecom Pvt. Ltd.) 13. Unitech Wireless (West) Pvt. Ltd. 

7. Haryana. 
1. Idea Cellular Ltd.(Earlier Escotel Mobile Communications(P) Ltd.) 2. Vodafone Essar Digilink Ltd.(Earlier Aircell Digilink India Ltd.) 3. BSNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Limited / Reliance Communication Limited 6. TataTeleservices Ltd. 7. Dishnet Wireless Ltd. 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 11. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 12. Unitech Wireless (North) Pvt. Ltd. 

8. Himachal Pradesh. 
1. BhartiAirtelLtd.(Earlier Bharti Telenet (Cellular) Ltd.) 2. Reliance Telecom Limited 3. BSNL 4. Idea Cellular Ltd.(Earlier Escorts Telecommunications Ltd.) 5. Reliance Infocomm Ltd. 6. Tata Teleservices Ltd. 7. Dishnet Wireless Ltd.(Earlier Dishnet DWL Ltd.) 8. Vodafone Essar SpacetelLtd. (Earler Essar Spacetel Ltd.) 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 10. Loop Telecom Pvt. Ltd. 11. STel Pvt. Ltd. 12. Datacom Solutions Pvt. Ltd. 13. UnitechWireless(North)Pvt.Ltd. 

9. Jammu & Kashmir. 
1. BSNL 2. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 3. Dishnet Wireless Ltd.(Earlier Dishnet DWL Ltd.) 4. Reliance Infocomm Limited 5. Vodafone Essar Spacetel Ltd.(Earlier Essar Spacetel Ltd.) 6. Tata Teleservice Ltd. 7. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 8. Idea Cellular Ltd. 9. Loop Telecom Pvt. Ltd. 10. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt.Ltd.) 11. STel Pvt.Ltd. 12. Unitech Wireless(North) Pvt. Ltd. 

10. Karnataka. 
1. Spice Communications Ltd. 2. Bharti Airtel Ltd.(Earlier Bharti Mobile Ltd.) 3. BSNL 4. Vodafone Essar South Ltd.(Earlier Hutchison Essar South Ltd.) 5. Reliance Infocomm Limited / Reliance Communications Ltd. 6. TataTeleservices Ltd. 7. Aircell Ltd. 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Unitech Wireless (South) Pvt. Ltd. 11. Datacom Solutions Pvt. Ltd. 12. Etisalat DBTelecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 

11. Kerala. 
1. Vodafone Essar Cellular Ltd.(Earlier BPL Cellular Ltd.(Hutch)) 2. Idea Cellular Ltd.(Earlier Escotel Mobile Communications Ltd.) 3. BSNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Limited / RelianceCommunications Ltd. 6. Tata Teleservices Ltd. 7. Dishnet Wireless Ltd 8. Sistema ShyamTeleservices Ltd.(Earlier ShyamTelelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Unitech Wireless(South) Pvt. Ltd. 11. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 12. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 

12. Kolkata. 
1. Bharti Airtel Ltd.(Earlier Bharti Mobitel(Cellular) Ltd.) 2. Vodafone Essar East Ltd.(Earlier Hutchison Telecom East Ltd.) 3. BSNL 4. Reliance Telecom Ltd.(Earlier Reliable Internet Services Ltd.) 5. Reliance communication Ltd.(Earlier Reliance Infocomm Ltd.) 6. Tata Teleservices Ltd. 7. Dishnet Wireless Ltd 8. Sistema ShyamTeleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Idea Cellular Ltd. 10. Loop Telecom Pvt. Ltd. 11. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 12. Unitech Wireless(Kolkata) Pvt. Ltd. 

13. Madhya Pradesh including Chhatisgarh. 
1. Idea Cellular Ltd.(Earlier BTA Cellcom Ltd.) 2. Reliance Telecom(P) Ltd. 3. BSNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance communications Ltd.(Reliance Infocomm Ltd.) 6. Tata Teleservices Ltd. 7. Dishnet Wireless Ltd 8. Vodafone Essar Spacetel Ltd. 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 10. Loop Telecom Pvt. Ltd. 11. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 12. Allianz Infratech Pvt. Ltd. 13. Unitech Wireless(West) Pvt. Ltd. 

14. Maharashtra & Goa. 
1. Vodafone Essar Cellular Ltd.(Earlier BPL Mobile Cellular Ltd.(Hutch)) 2. Idea Cellular Ltd. 3. BSNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Limited 6. Reliance Communications Ltd. 6A. Tata Teleservices(Maharashtra) Ltd. 7. Aircell Ltd. 8. Sistema Shyam Teleservices Ltd.(EarlierShyamTelelinkLtd.) 9. Loop Telecom Pvt. Ltd. 10. Datacom Solutions Pvt. Ltd. 11. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 12. Unitech Wireless (West) Pvt. Ltd. 

15. Mumbai. 
1. LoopMobile (India) Ltd.(Earlier Hutch Essar Cellular Ltd (BPL Mobile Communications Ltd.)) 2. Vodafone Essar Ltd. (Earlier Hutchison Max Telecom. Pvt. Ltd.) 3. MTNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Ltd / Reliance Communications Ltd. 6. Tata Teleservices(Maharashtra) Ltd. 7. Idea Cellular Ltd. 8. Aircell Ltd. 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 10. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 11. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 12. Unitech Wireless(Mumbai) Pvt. Ltd.  

16. NorthEast (NE-1 & NE-2). 
1. Reliance Telecom(P) Ltd. 2. Bharti Hexacom Limited 3. BSNL 4. Dishnet Wireless Ltd.(Earlier Dishnet DWL Ltd.) 5. Vodafone Essar Space tel Ltd. 6. Tata Teleservice Ltd. 7. Sistema Shyam Teleservices Ltd. (Earlier Shyam Telelink Ltd.) 8. Idea Cellular Ltd. 9. Loop Telecom Pvt. Ltd. 10. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 11. STel Pvt. Ltd. 12. Unitech Wireless(East) Pvt. Ltd. 

17. Orissa. 
1. Reliance Telecom(P) Ltd. 2. BSNL 3. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 4. Dishnet Wireless Ltd.(Earlier Dishnet DWL Ltd.) 5. Reliance Infocomm Ltd. 6. Tata Teleservices Ltd. 7. Vodafone Essar Spacetel Ltd. 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Idea Cellular Ltd. 10. Loop Telecom Pvt. Ltd. 11. Unitech Wireless(East) Pvt. Ltd. 12. Datacom Solutions Pvt. Ltd. 13. STel Pvt. Ltd. 

18. Punjab. 
1. Spice Communications Pvt. Ltd. 2. Bharti Airtel Ltd.(Earlier Bharti Mobile Ltd.) 3. BSNL 4. Vodafone Essar South Ltd.(Earlier Hutchison Essar South Ltd.) 5. Reliance Infocomm Limited / Reliance Communication Limited 6. Tata Teleservices Ltd. 7. Dishnet Wireless Ltd. 8. Quadrant Televentures Ltd. (Previously HFCL Infotel Ltd.) 9. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 10. Loop Telecom Pvt. Ltd. 11. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 12. Datacom Solutions Pvt. Ltd. 13. Unitech Wireless(North) Pvt. Ltd. 

19. Rajasthan. 
1. Vodafone Essar Digilink Ltd.(Earlier Aircell Digilink India Ltd.) 2. Bharti Hexacom Ltd. 3. BSNL 4. Idea cellular Ltd. (Earlier Escorts Telecommunications Ltd.) 5. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 6. Reliance communications Ltd.(Reliance Infocomm Ltd.) 7. Tata Teleservices Ltd. 8. Aircell Ltd. 9. LoopTelecom Pvt. Ltd. 10. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 11. Datacom Solutions Pvt. Ltd. 12. Unitech Wireless(North) Pvt. Ltd. 

20. Tamilnadu. 
1. Vodafone Essar Cellular Ltd. (Earlier BPL Mobile Cellular Ltd.(Hutch)) 2. Aircell Ltd. 3. BSNL 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Ltd / Reliance Communication Ltd. 6. Tata Teleservices Ltd. 7. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 8. Idea Cellular Ltd. 9. Loop Telecom Pvt. Ltd. 10. Unitech Wireless(Tamilnadu) Pvt. Ltd. 11. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 12. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 

21. U.P.(East). 
1. Vodafone Essar Digilink Ltd.(Earlier Aircell Digilink India Ltd.(Hutch)) 2. BSNL 3. Idea Cellular Ltd.(Earlier Escorts Telecommunications Ltd) 4. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 5. Reliance Infocomm Limited / Reliance Communications Ltd. 6. Tata Teleservices Ltd. 7. Dishnet Wireless Ltd 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Unitech Wireless(East) Pvt.Ltd.Unitech Wireless(Tamilnadu) Pvt. Ltd. 11. Datacom Solutions Pvt. Ltd. 12. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 

22. U.P.(West) including Uttaranchal. 
1. Idea Cellular Ltd.(Earlier Escotel MobileCommunicationsPvt.Ltd.) 2. BSNL 3. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 4. Reliance Infocomm Ltd. / Reliance Communications Ltd. 5. Tata Teleservices Ltd. 6. Vodafone Essar South Ltd.(Earlier Hutchison Essar South Ltd.) 7. Dishnet Wireless Ltd.(Earlier Dishnet DWL Ltd.) 8. Sistema Shyam Teleservices Ltd.(Earlier Shyam Telelink Ltd.) 9. Loop Telecom Pvt. Ltd. 10. Videocon Telecommunications Ltd.(Earlier Datacom Solutions Pvt. Ltd.) 11. Etisalat DB Telecom Pvt. Ltd.(Earlier Swan Telecom Pvt. Ltd.) 12. Unitech Wireless(North) Pvt. Ltd. Unitech Wireless(Tamilnadu) Pvt. Ltd. 

23. West Bengal including A&N. 
1. Reliance Telecom(P) Ltd. 2. BSNL 3. Bharti Airtel Ltd.(Earlier Bharti Cellular Ltd.) 4. Reliance communications Ltd.(Reliance Infocomm Ltd) 5. Tata Teleservices Ltd. 6. Vodafone Essar South Ltd.(Earlier Hutchison Essar South Ltd.) 7. Dishnet Wireless Ltd.(Earlier Dishnet DSL Ltd.) 8. Unitech Wireless(East) Pvt. Ltd. 9. Idea Cellular Ltd. 10. Sistema ShyamTeleservicesLtd.(Earlier Shyam Telelink Ltd.) 11. Loop Telecom Pvt. Ltd. 12. Datacom Solutions Pvt. Ltd.

Take a look for list of  MSC(Mobile Switching Center) & SP Codes(Mobile levels) of all networks issued by DOT(Department of Telecom)  as on 30-June-2012
 
Courtesy: http://www.bsnlteleservices.com/