If your on O2 in the uk then you need to get this app from the AppStore!! It is soo useful!

Create an account on the o2.co.uk website and use the details to login inside the app!

It can show you how many minutes left or used same with texts and also ur monthly spend and a brake down of where those costs have come from I.e. Txts calls to premium numbers etc

It costs .59p and is totaly worth the money!