Originally Posted by gibby71
Just get the 3Gs on your wife's phone line. Switch the sims then call AT&T and let them know you traded phones.
You dont even have to call AT&T. I just did exactly this and just switched sim cards, now i have my wifes 3GS and she has my 3G. It even shows the phones correctly under my account on AT&T wireless.com. Just make sure to activate the 3GS under your wife's line before doing the sim switch, and of course backup the 3G. I was amazed at how easy it was, even the activation. I must have got lucky!