I want to get the new 3GS, I have a 16gb 3G currently. I know I will be charged $499 for the 32gb model. I will be moving out of the country in 3 months and canceling my att contract (one line on a family plan). I'm paying an ETF regardless of whether or not I upgrade, so I'd like to the the 3GS for the next few months. My question is, can ATT charge me for the rest of the phone's cost? As in slap me with the $175 ETF and the $200 subsidy they paid for the phone?