We were just envying LG's amazing Voice to Text app, wishing it were on other Windows Phones and evidently others at XDA thought the same. Difference being they went ahead and they allegedly patched the XAP file so as to make it work on any unlocked Windows Phone.  (Similar case with Samsung's apps).

To see if it works we tried it ourselves and sure enough, it does what it was meant to do. Most of you won't have a developer unlocked device to do this and the ChevronWP7 loop hole will be patched soon, plus there's the whole thing that this is technically stealing LG's software and one of their device selling points (though everyone seems okay with loading WP7 on their HD2s, with no concern there--double standard we guess). So you know, we don't recommend you do this, even if you could, which you probably can't.

Source: XDA