It ends 5th of February. GoPayment will stop working for mobile phones with Nokia Lumia 900 and other Windows 7  phones. They insist that users should try Android instead.

“We will soon remove the GoPayment App for Windows 7-based mobile devices. This decision was taken after careful consideration, to ensure that we can continue to provide the best user experience for our customers. As a result, the GoPayment App no longer work on Windows 7 mobile device from the 5th February 2013.”