Well I was going to wait until the release of the iPhone 5, but I checked my upgrade options through AT&T and apparently I can get a refurbished iPhone 4 for around $100. Has anyone had any problems with a refurbished iPhone? I also have another upgrade due in Feb. So I'm thinking this is too good of a deal to pass up. Anyone doing so? Btw, I'm using an iPhone 3G at the moment.