Hi, I had an iPhone 4 and my friend had an Iphone 3gs. we both exchanged our mobiles. Now am not able to sync music , videos, ringtones or apps. Somehow contacts alone synced. When trying to get apps, it shows as its there in my screen in iTunes (it shows 4 scrollable screens, but in my mobile i have only 3 screens) but my mobile doesn't have anything. i have deleted iCloud account, thinking that could be problem and also set my account in this phone.