Freecharge has launched Juice app that lets mobile phone users track their talktime balance and data balance and where it is being spent.
Juice aggregates voice and data usage (via reading your messages), although the company claims that privacy of the users is secured.
The app currently works in few smartphone devices and not all (for e.g. Mi phones). The app supports Airtel, Vodafone, Idea, Cellone (BSNL GSM), Reliance GSM and Aircel.
Nice app. Would like to use it