Quick question. My wife recently dropped her 3GS and shattered the screen and damaged the display. We're going to replace it with another 3GS from AT&T. Here is my question: her phone is currently on iOS 4.0. The new phone will be running iOS 4.3.4. I did finally back up her phone. Would it make sense to upgrade her broken phone (which still runs, just the display is messed up) to 4.3.4 and then back-up again, or will the new phone not care? My question is this: are there any issues in restoring from a back-up to a new phone when the old phone was on a much earlier version of iOS (4.0) and the new one will be up-to-date? Thanks.