The mailbox has other kinds of cheats, like making needs static, making friends, also for setting career level.
I meant to say in my previous post, I hadn't played the PS3 version "for a while", I don't know where the rest of my sentence went. I recently changed to the PC version, so I get confused between the ps3 version and PC version, as they are quite different as far as cheats and fixing things etc.
Let me know if you get your Sim unstuck. Another thing I used to do on the PS3, was save often, and have two or three saved files of the same game, so at least if one glitched, I could go to another saved file and play that, even if that save was a sim day or two behind the glitched game. At least that way you don't lose everything from a glitched game (learnt that the hard way lol)