One of the few areas in which Windows Phone OEMs can differentiate is in custom apps. They get their own special section in the marketplace which only their own devices can access – for instance, the HTC Hub is only available for HTC devices, and Nokia Music only for Lumia 710/800.
There are a number of ways to bypass this restriction, however, with GoodDayToDie‘s solution being the easiest one: You install a special XAP (which means that you must be developer unlocked), reboot your phone, and voilà, you can install those vendor-exclusive apps now. There’s a catch, though: You can only access one OEM marketplace at a time – that is, if you have an HTC device and installed the “Samsung Apps.xap”, you’ll lose access to HTC’s marketplace. Now, if you install “LG Apps.xap”, you’ll again lose access to Samsung’s marketplace, and so on. Good thing is, the apps you installed will continue to work, and after a day or two your device should automatically revert to its standard marketplace.
Sounds good enough? Be sure to read the dev’s description before downloading the XAPs in the forum thread._________