If that extra Dropbox storage helped swing the Galaxy S III pendulum in your favor, and you happen to be using Verizon or AT&T as your cellular provider, I have some bad news to deliver. Droid Life reports that one such expectant customer was asking Dropbox, via its forums, where their storage was. The cloud-space provider informed them that not all carriers are offering the deal, with those two big hitters being among them. This is further confirmed elsewhere on its support pages.
Source: Droid Life, Dropbox