Im using Lumia 920 and Windows XP as my desktop OS (yes it is old, but i still like it and there is a thing. I thaught then when I connect phone via cable to PC and install some apps(using PC to navigate store), it will download app using computers data connection and will not use my celluar data connection (logical huh?), but appears that this is not the case.. Recently I get suspicious about amount of used data and before installing app through cable I disable phones data connection and app was not be able to get installed.. Really? Is situation different when using Windows 7 or 8 and Windows Phone app?