I have problem (in reality not one but a lot of problems), I'm developing Windows Phone 8 App that use BackgroundTransferService for transfer recorded wav file, on HTC 8S working almost fine, but...

I am using Visual Studio 2013 on Windows 8. I have got three Windows Phone devices, lumia 620, 920, 1320 and these are all developer unlocked devices. The 620 device has got Windows Phone 8.1 previ...