click here to check 
transaction status
Now you can pay your airtel postpaid mobile bill instantly from airtel website anytime anywhere.
There are no additional charges for paying bills online.
  *airtel postpaid mobile number : email id :
  *amount (र) : To know your outstanding - SMS OT to 121 OR click here  (One time password
(OTP) will be sent to your mobile number entered above)
  *type the code shown :
Try a new code.
By entering this code you help airtel prevent spam and fake transactions. This code can be typed in all numerics.
(Fields marked with * are mandatory)
* Please enter the correct airtel number and note that airtel will not be responsible for the correctness of the airtel number entered above.
* In case you do not receive the payment confirmation, please click on the 'Check transaction status' link above and ascertain the status of your transaction.