BSNL, the state owned mobile network in India has released their official app for Windows Phone devices. This app will allow you to do mobile recharges, bill payments, etc,.
* All payment options – credit card, debit card and net banking.
* View Prepaid Balance and validity
* Prepaid TopUp, Loading Plan / Migration Voucher
* Postpaid bill Enquiry
* PostPaid Bill Payment GSM, CDMA, Landline and WiMAx.
* View Bill Payment History for all your numbers.
Download it here from Windows Phone Store for free.
Thanks to Gaurav for the heads up.