I am one of the lucky ones that actually got on a trial that they kept for using iphones at our company. I have now had my 3G for more than 13 months so what happens when we get the 4G, will I be able to upgrade even though it is a corporate account if I go in and just buys it myself? Since the trial started my company has stopped buying new iphones but whoever has one can keep using it. I love it but the low battery time and also the speed makes me want to pay the upgrade fee myself to get the new 4G. My company doesn't care but will ATT be ok with it? Anyone tried to upgrade an iphone on a corporate account?