I upgraded my iTunes on my phone as well as the OS- and somehow- you messed up my whole phone! Any changes to my contacts, texts or photos from May 2013 through Dec 2014- gone. GONE!
I've hot most of my contacts back but not all.
Basically it took me way too long to try it get it situated. So while I love my phone, lesson learned. You are a rock star of a phone- so long as I don't connect you to ITunes!