That is the older-style BB, correct?

I would trade my new, fancy, easily-broken versions for the old brick in an instant. Corporate IT ends up issuing me one of the new plastic ones about once every six months because they break when being dropped on escalators in FRA, dropped by the TSA at security, etc. The old ones where far more durable.

Question: If I take my ATT SIM out of my new phone, and put it into an old BB like Dingo's, is there any reason why it wouldn't work?