Hi, I'm running an old iPhone 4 and still using IOS 6 on it as I've been wary of upgrading to IOS7 incase it slows it down. I'm going to upgrade to iPhone 5s (it's ordered ) and give my old iPhone 4 to my dad. When my new one arrives should I 'restore using backup' of the iPhone 4 or not?? I've never upgraded my iPhone before and reading a few websites they say they restoring from backup is easy but should both be running IOS7 - so will this cause a problem? Am I better to set up the 5s as a new phone and just sync iCloud stuff (if so what would be missing?) and then download apps that I want to have on to the 5s?? Hope that makes sense and all advice really appreciated.