There are currently more than 1000 providers available, such as MTS, Beeline, Megafon, Tele2, Velcom, Onlime, Dom.ru, Domolink, Alfabank, Sberbank, Life and much more!
The app supports automatic balance refresh after the specified interval, after a call, after sms sent.
You can set up notifications on balance change and other events.
Feel free contact author if you have any questions, or you have not found your provider among supported ones.
Please find full information on http://any-balance-providers.googlecode.com