Prepaid Accounts Only
For Airtel 2G balance *123*10#
For Airtel 3G balance *123*11#
For Aircel 2G  and 3G balance *126*4#  Full details*126*6#

How to Check Your Account Balance on Vodafone Network?
Check Account Balance: *141#
Or SMS BAL to 140 (toll free)
Customer Care: 111
or *111#
SMS counter: *160#
Free minute balance: *162#
Vodaphone Internet Balance: sms GPRS to 144
How to know Account Balance on Idea Network?
Check Account Balance: *130#
Customer Care: Your Idea cell number 12345
(or http://www.ideacellular.com/IDEA.portal?_nfpb=true&_pageLabel=IDEA_Page_CustomerCare)
Check SMS Balance: Try any one of these numbers – *212# OR *112# OR *167*1# OR *123# OR *111#
 BSNL 
Check Account Balance: *123#
Customer Care: 1957
Check SMS balance: Dial *112#
follow the instructions.
 Reliance GSM 
Check Account Balance: *367#
Customer Care: *333
 Aircel Network?
Check Account Balance: *125#
Voice based account balance check: 123
Customer Care: 121
2G/3G Data Balance:
- UP East: *126*4#
- UP West: *126*1#
- *126*1#
How to Check Your Account Balance on Airtel 
Check Account Balance: *123#
Booster pack Expiry: *124#
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#
Customer Care: 121
GPRS/Internet usage: *123*10#.
How to Check internet  Balance on Tata Docomo 
Check Account Balance: *111#  internet balance*111*1#
Voice based account balance check: 12525
Customer Care: (http://www.tatadocomo.com/customer-care.aspx)
Check Your GPRS/Internet/SMS Balance usage on Tata Docomo
Dial: *191#
You will receive a service reply with 8-9 options.
The 5th option is for ‘status of free usage’ . Click on ‘Answer’ and enter 5, and click on Send. You will get message about the GPRS/SMS and other balances.
Check SMS Count: Dail *191# and then go to pool balance. Then Docomo will send you a SMS with extra local/STD mins and daily SMS’s,
 Check Your Account Balance on Virgin Mobile ?
Check Account Balance: 125555 and then press 2
or sms BA 58576
Spice Mobile ?
Check Account Balance and Validity: *456#
Voice Based Account and Validity check: 456

If any one knows please comment Below