It would be a frustrating situation where your iPhone won't sync with iTunes without any sign. As you can imagine, when you have to restore your iPhone in some special cases, but there is no way to do a backup on iTunes to avoid losing data as your iPhone can not be synced with iTunes, what should you do? Don't you have any clue about it? Well, in this piece, 5 reasonable solutions are brought out to assist you in disposing of this problem methodically.