Question: how to connect iphone to new itunes without losing data?
Answer: Launch the iTunes application on your Mac or PC computer.
Go to "Preferences" in the "iTunes" menu on Macs or the "Edit" menu in Windows.
Navigate to the "Devices" tab at the top of the pop-up window, check the box next to "Prevent iPods, iPhones, and iPads from syncing automatically" and then click "OK."