Select the'Manually manage music and videos' and click 'OK' to sync content manually.Click your iPhone in the 'Devices' tab in the iTunes window and click 'Summary'.The message tells you the phone is synced with another iTunes library on another computer.Click the 'Cancel' button when the iTunes syncing message turns up on the screen.Launch iTunes if it doesn't start automatically.Connect your iPhone to the new computer with which you wish to sync it.How to sync iPhone to/with a new computer without erasing from iTunes Summary? ( how to add music to iPhone without deleting music already on it?) With manual sync, you could transfer music and some other media files to a new computer without losing data. This feature can be convenient if you don't have access to your default computer. So, how to sync iPhone music without erasing? It is feasible in the case that you set iTunes to manage music and videos files manually.

Will syncing my iPhone to iTunes erase everything? Well, it depends. #1: Sync iPhone with New Computer without Erasing from iTunes Summary

#4: Sync iPhone to a New Computer without Erasing via Dedicated Software.

#3: Sync iPhone to a New Computer without Losing Data from iTunes File.#2: Back Up iPhone to New Computer without Losing Data by Copying iTunes Backup Folder.#1: Sync iPhone with New Computer without Erasing from iTunes Summary.

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