People who upgraded from the first generation iPhone to the 3G iPhone do not. Why? Because Apple and AT&T deactivated the cellular radio inside the first-generation iPhone. You can't just pop your SIM card out of the 3G iPhone and stick it back into the old one. iTunes forces you to reactivate the original iPhone, and things get murky if you already have one activated on that SIM card.
Having a back-up phone is important to me. I'd like for my back-up phone to be my first-generation iPhone. After all, I did pay full retail price for it. But I can't use it because Apple and AT&T bricked it.
Right now, my only option is to unlock and jailbreak my first-generation iPhone to get the cellular radio working again. I shouldn't have to take that step.
So I have to ask, why?
Why are first-generation iPhones bricked? How is it acceptable that you can disable a piece of my property? No other manufacturers do this. Apple, AT&T, I want my first-generation iPhone to be available as a back-up phone. Fix it.