hi....my first post here. I was hoping i could get some insight into this. I have a 32gb 3GS that has a non working earphone jack. I purchased less than a year ago so its still under warranty. In the meantime i have the option to upgrade to the iphone 4 so my question is if i get a replacement for my warranty covered 3GS... will that void my upgrade option? I would like to replace my 3GS for free under the warranty.... then purchase the iphone 4 with my upgrade discount.