USSD piBalance—track balance

Track your balance/limits/credits/data over USSD (Android 4.1+) or SMS requests and show changes in nice widget. Full history/statistics supported in Pro version. Background requests supported after call, on schedule etc. If you use code like *100# for getting your balance, you can easily configure piBalance to use this code.

And the following mobile operators supported out of the box:

Australia: Optus, Lebara

Belgium: Base (KPN Orange)

Bosnia and Herzegovina: BH Telecom

Bolivia: Tigo

Brasil: VIVO, TIM

China: China mobile, China Unicom

Costa Rica: Kolbi I.C.E., Movistar

Finland: DNA Finland

France: Free

Greece: Vodafone

India: Vodafone IN, TATA DOCOMO, Aircell, Reliance, CellOne

Indonesia: INDOSAT

Ireland: Vodafone IE

Kazakhstan: Tele2

Kyrgyzstan: Megacom, Beeline

Latvia: BITE

Malta: Vodafone

Nigeria: Nigeria Communications (MTN)

Namibia: MTC

New Zealand: Vodafone

Pakistan: Ufone (Pak Telecom Mobile)

Poland: Orange

Portugal: Optimus (Sonaecom)

Philippines: Globe, Sun

Romania: Orange (MobilRom)

Russia: MTS, Megafon, Tele2, Beeline, SCS, UTEL, Smarts, BaykalWestCom, Rostelecom

South Africa: Vodacom, Cell-C, 8.ta

Serbia: TElenor

Switzerland: Swisscom

Sri Lanka: Dialog

Tajikistan: MegaFon

Thailand: Dtac

Turkey: AVEA

Turkmenistan: CELL, MTS

UK: T-mobile, O2, Vodafone

Ukraine: Life:), Kyivstar, MTS, Beeline, Utel

Uzbekistan: Beeline

kw: balance, limits, ussd, widget, check balance