Would Iphone 3g Work if Sim Card Was Empty With No Service?

I Bought a iphone 3G with No Sim Card an Itunes won't Register it, I Bought it So i could use as IPOD for Music. If i Get a Sim card From old Phone would it work, or can i buy an Empty Sim Card from AT&T, I have No money so i Can't Make a Service Account with At&T

Yes thats bad

If the phone is unlocked you can put literally any SIM card that fits into it and it should activate and let you use it for music.