Hi all. I currently have an s2 but its starting to get slow and freeze and over heat. I've only had it a year but I have extreme butterfigers and my phone has met the pavement many times. Im elegible for an uograde and if I upgrade before this one dies I can trade it for a $100 credit towards a new phone. So I can get the s3 for free or I can get the s4 for $100. Does anyone have either and can give me a review? Thanks!