Ok I have been searching for days about this now and I still cannot find a simple answer, and the reassurance I need.. I know there are a million posts about this, but they just don't answer it simply for me... I am trying to sync my iphone 4 with my itunes because I can no longer update the music on my phone. I get the message "Do you want to erase this iphone & sync with this itunes library." If I click yes, to erase & sync, will I; - Lose my contacts? - Lose my photos? - Lose my messages? Or does this only erase & sync up music & apps? I have transferred my apps to my itunes library, but the box to 'Sync Apps' is not ticked. Do I need to tick these boxes for apps, music, photos if I am going to erase & sync, or do I leave them unticked? I have backed up my iphone with itunes. I really do not want to lose my messages & contacts. Any simple advice please?????