Just spotted this and tested…works like a charm with my EVO 4G! If you are going to try it, hurry because from what I can tell, you only have until December 31st 2011.
Box and it’s cloud storage service is apparently running some sort of free 50GB upgrade for owners of the Sony Xperia Play and various LG phones through the end of the year (yep, just 3 days left). Why we aren’t see it for every Android phone is beyond me, but Sony and LG likely struck some sort of deal to make their devices look more appealing. If you don’t own either though, you can get the 50GB thanks to a handy little app created by developer redphx. Previous attempts to get devices the free space were limited to rooted phones and forced you to edit your build.prop, but this new app allows you to get it by simply signing into your Box account.