What have you guys done? I'm trying to decide if I should restore my current backup, which has been progressing since my 3GS days, or set up my iPhone 6 Plus as a new device and build everything back up from there. I've heard that certain battery or system issues can be caused from backups as well as regular problems with the device or iOS, so I would want to start of new in order to erase any potential issues. What do you guys think? All of my contacts and personal data will still be kept from my SIM and iCloud account, correct?