Telefónica O2 Germany is showing more confidence in Windows Phone and has recently launched "Mein O2" (My O2) for Windows Phone. With its latest launch, the German carrier follows the previously launched Android and iOS versions. Like its Android and iOS counterparts, the Windows Phone version shows post paid customers the telephony, text message and mobile data usage in real time and even forecasts the expected mobile data usage. Furthermore it shows and allows to download the past 6 invoices and itemized bills and provides an overview of the bill amount of the past five years. Last but not least it gives access to the master file data and even allows to edit the invoice address, bank account details and more.
As you might expect it from a German network operator, Mein O2 is only available in German and requires Windows Phone 8; Windows Phone 7.x is unfortunately not supported.
Cheers ~ Arne