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Idea

Idea Cellular, usually referred to as Idea, is a wireless telephony company operating in all the 22 telecom circles in India based in Mumbai.
Costomer care number is 458.
To recharge dial *457*pin#
To chek balance dial *123#
Numbers starts with 8606, 9605, 9526, 9544,9744, 9747, 9847, 9947, 9656, 9961 and 9526 in Kerala.

AirTel

Bharti Airtel Limited commonly known as airtel, is an Indian telecommunications company that operates in 19 countries across South Asia, Africa and the Channel Islands. It operates a GSM network in all countries, providing 2G or 3G services depending upon the country of operation. Airtel is the fifth largest telecom operator in the world with over 207.8 million subscribers across 19 countries at the end of 2010. It is the largest cellular service provider in India, with over 152.5 million subscribers at the end of 2010. Airtel is the 3rd largest in-country mobile operator by subscriber base, behind China Mobile and China Unicom.
Costomer care number is 121.
To recharge dial *101*pin#
Check balance dial *123#
Number starts with 8129, 8281, 9633, 9746, 9567, 9895 and 9995 in Kerala.

BSNL

Bharat Sanchar Nigam Limited (abbreviated BSNL; भारत संचार निगम लिमिटिड) is a state-owned telecommunications company headquartered in New Delhi, India. BSNL is one of the largest Indian cellular service providers, with over 86.4 million subscribers as of March 2011, and the largest land line telephone provider in India. However, in recent years the company's revenue and market share plunged into heavy losses due to intense competition in Indian telecommunications sector.
Call costomer care to 9447024365.
To recharge dial *123*pin#
Check balance dial *123#
Number starts with 8547, 9400, 9446, 9447, 9495, 9496 and 9497 in Kerala.

Vodafone

Vodafone Essar, commonly referred to as Vodafone, is a cellular operator in India that covers 23 telecom circles in India. It was formerly known as Hutchison Essar. It is based in Mumbai.Vodafone Essar is the Indian subsidiary of Vodafone Group. Formerly, 33% share in the firm was owned by Essar Group. Vodafone Group bought out the 33% stake of Essar Group for $5 billion to became the sole owner of the firm. It is the second largest mobile phone operator in terms of revenue behind Bharti Airtel, and third largest in terms of customers.Vodafone had about 134.5 million customers as of February 2011.
Costomer cara number is 111.
To recharge dial *140*pin#
To know balance dial *141#
Number starts with 8943, 8086, 9539, 9645, 9745, 9846, 9946 and 9048 in Kerala.

RELIANCE GSM

Reliance newly started their GSM service in 2009. Reliance GSM is having a 3G ready network but does not have 3G license for Kerala circle.
Costomer care number is *333.
To recharge dial *368*pin#
To check balance dial *367#
Number starts with 8590, 8893 and 9020 in Kerala.

TATA DOCOMO

TATA DoCoMo, usually referred to as DoCoMo (not to be confused with NTT Docomo), is a Tata Teleservices Limited (TTSL) owned cellular service provider on the GSM platform-arising out of the Tata Group's strategic joint venture with Japanese telecom giant NTT Docomo in November 2008. Tata Teleservices received a a license to operate GSM telecom services in 19 telecom Circles and has been allotted spectrum in 18 of these circles, under the brand "TATA DoCoMo". Tata Docomo launched GSM services on 24 June 2009. It first launched in South India and currently operates in 18 of 22 telecom circles.
Costomer care number is 121.
Balace chek *111#
Recharge *135*2*pin#
Numbers starts with 7736, 8714, 8089, 8891, 9/37 and 9072 in Kerala.