A new free storage promotion from Box leaked today, this time for users with Sony Ericsson Xperia phones. If you use the Box app on such a device, they will give you 50GB extra storage for no additional cost. Similar to the still-ongoing ‘Size Matters‘ campaign for iOS users, this 50GB will last for as long as you actually have your Box account, but you are still restricted to 100MB per file and the painful upload process. The lack of a Dropbox-esque desktop client may render it irrelevant for some, however if you have an HP TouchPad, iOS device, Xperia/HTC Sense 3.5 phone or even a BlackBerry PlayBook, head on over to the Box website to grab the relevent app and free storage for life.

Update: Sony and Box have apologised, and this promotion is not active at the time being. LG users however are getting 50GB free so head on over to the Box Android app with your Optimus Pad (!) to claim your free gigabytes.