piBalance - Your balance

Simple and nice widget displays your bill balance on home screen. Also displays the daily balance change. Can be easy configured to your carrier. Application uses sms to send balance request and listens sms with response. Its free for most carriers.
The following mobile operators supported out of the box:
Australia: Optus
Belgium: Base (PN Orange)
Bosnia and Herzegovina: BH Telecom
Brasil: VIVO, TIM
China: China mobile
Costa Rica: olbi I.C.E.
Finland: DNA Finland
France: Free
Greece: Vodafone
India: Vodafone IN, TATA DOCOMO
Ireland: Vodafone IE
azakhstan: Tele2
yrgyzstan: Megacom, Beeline
Latvia: BITE
Nigeria: Nigeria Communications (MTN)
Pakistan: Ufone (Pak Telecom Mobile)
Poland: Orange
Portugal: Optimus (Sonaecom)
Romania: Orange (MobilRom)
Russia: MTS, Megafon, SCS, UTEL, Smarts, BaykalWestCom, Rostelecom
South Africa: Vodacom, Cell-C
Turkey: AVEA
Turkmenistan: CELL, MTS
U: T-mobile, O2, Vodafone
Ukraine: Life:), yivstar