Discussion on:

Get Box on your Android tablet to share, store, and collaborate

I just registered a personal account and only received the standard 5GB limit with a 25MB max file size. What gives?

To get the 50GB upgrade you have to create the account through the Android app. They definitely don't make this obvious on the Box website and it took a quick call to their customer service to find it out. I am not sure it a previously created account will upgrade the first time you log in via the app though.