Fulltalktime.com

• Airtel Customer Care – Call 121 from Airtel mobile number.
• To check the balance – Dail *123# and press OK
• To subscriber Hello Tunes – SMS Songname to 543215 or call 543215, customers can select your songs.
• To unsubscribe Hello Tunes – SMS STOP to 543211808
• Charges of Hello Tunes – Rs 15 for download and Rs 30/mon charges.
• To subscribe DND – SMS START ‘DND’ to 121
• To unsubscibe DND – SMS STOP “DND’to 121
• Any clarification regarding products and services just – Dail 9849098490

Idea

• Customer Care – 1234
• Dialer Tone of Idea – SMS DT <code number> 55456 (code numbers are given in official site. Rental Rs 30/mon and Rs 15/song download. Charges Rs 30/mon and Rs 15 for song download.
• Activate DND -  SMS START ‘DND’ to 1234 and DeactivateDND – SMS ‘STOP’ to 1234

Vodafone

• Customer Care No. – Dial *111# and press the calling key
• Check Account Balance: *141# Or SMS BAL to 140 (toll free)
• Call Vodafone Care on 198 (tollfree) or 111 (chargeable) from your Vodafone mobile phone.
• Vodaphone Internet Balance: sms GPRS to 144
• DND – Call 1909 (toll free) and select preference required for activation/deactivation (Full DND/Partial DND).

Reliance

• To check balance Dial *367 or SMS ‘BAL’ to 53670
• For any other service – * Dial *333 from your Reliance phone or email to customer@relianceada.com
• Caller Tune – Dial 51234567 @ Rs3/min
• To Copy Caller Tune – Press Star(*) button on your phone and copy your friend’s callertune whenever you call and hear their  tune
• Caller Tune – SMS Just type CT <tune code> to 51234 to set any song as your callertune (tune code just check in offesial site).
• To activate Roaming Charges – Dail *333 for Preapiad customers.
• To Activate and Deactive DND fully – Call 1909 or type <START 0> and send SMS on 1909 for fully blocked. To De-Activate type <STOP 0> type 1901

BSNL

• Helpline – 800-180-1503 or 1503 (All over India).
• Balance check – *123#
• Customer Care: 1957
• Check SMS balance: Dial *112#
• follow the instructions.

Aircel

• Check Account Balance: *125#
• Voice based account balance check: 123
• Customer Care: 121
• Daily sms counter( old Rs.60 recharge/750 sms FREE per day): *125*2#
• SMS limit in new Rs.60 recharge (22000 local sms FREE per month) : *123*3#
• GPRS/Internet usage: *123*1

Tata Docomo

• Check Account Balance: *111#
• Voice based account balance check: 12525
• SMS the WTcode to 12800, charges Rs 3/SMS (check the code in official site), Rs 10 for 30 days. (Autorenewed after 30 days)