I have an iPhone that I have been using with a prepaid sim for a few weeks, but I want to use it as my main phone now. I have an awesome plan with att that I do not want to get rid of by switching to an iPhone plan. I know I wont get visual voicemail this way, but that does not really matter to me. If I put my ATT sim in my Activated + Jailbroken iPhone, will att yank my corp discount, or will I just get the F999 error when I log into their website, but not adverse action? I know they can not change my plan or extend my contract without my consent, but I am sure they could pull my discount if they wanted too.