top icon

Rated successfully!


You have already rated this article, please do not repeat scoring!

The Truth behind iTunes Sync – Sync iPhone iOS 13

home_icon Created with Sketch. Home > iTunes Issues > The Truth behind iTunes Sync – Sync iPhone iOS 13
User Img
Aaron Donald

June 13, 2017 (Updated: September 3, 2019锛

3 min read

0 Count

You can also read this guide in Fran莽ais.

iTunes syncing is the typical way to transfer media between your iPhone/iPad/iPod and your computer, but did you know that there could be unintended consequences? There are limits to the syncing process itself, and it can also end up erasing some of your songs if you鈥檙e not careful.

The Truth Behind iTunes Syncing

With iTunes, you can sync certain kinds of files, such as songs, playlists, tones, albums, TV shows, movies, books, audiobooks, podcasts, photos, videos, calendars, contacts, and your backups.

What Does iTunes Sync Do?

When you sync your iPhone with iTunes, it will attempt to make all of the data in your iTunes library and on your iPhone the same. It does this by basically replacing the content that is on your iPhone with the content that is in your iTunes library. This can end up erasing some of your iPhone data, especially if the files were not purchased from the official iTunes store.

When you turn on iTunes syncing, your content will from then on automatically sync when you connect your iPhone to your computer while iTunes is open. You have to turn off syncing if you don鈥檛 want this to happen automatically.

How to Sync Music to iPhone with iTunes Using USB

Generally, we can sync iTunes music to iPhone using a simple USB connection.

  1. Launch iTunes and connect your iPhone with your USB cable.
  2. Click on the device tab at the top left corner on iTunes and click it.
  3. Look for the 鈥淢usic鈥 category at the left sidebar.
  4. Check the box next to where it says 鈥淪ync Music鈥.
  5. You can tick 鈥淓ntire music library鈥 or tick 鈥淪elected playlists, artists, albums, and genres鈥 to sync some specific songs.
  6. Click on 鈥淪ync鈥 button once done.
iTunes sycn

How to Sync Music to iPhone with iTunes Using Wi-Fi

You can also use a WIFI connection to sync your music:

  1. Connect your iPhone to your computer with a cable.
  2. Open iTunes, and click where your iPhone.
  3. Go to the Summary area and tick the box next to 鈥淪ync with this [your device] over Wi-Fi."
  4. Click Apply. Unplug your iPhone.
  5. Select what you want to sync, and then click Sync.
iTunes sync over wifi

Note: when your iPhone and computer are in the same Wi-Fi network, your iPhone will appear in iTunes.

What to Do If You Can鈥檛 Set iTunes to Sync over Wi-Fi

  • Reboot your computer and restart your iPhone.
  • Make certain that both your computer and iPhone are attempting to sync over the same network. Check the SSID of your network in your device鈥檚 WIFI settings and be sure they match the network your computer is connected to.
  • Make sure that there is no firewall that is blocking the communication. Particularly, TCP ports 123 and 3689, as well as UDP ports 123 and 5353, should be open.

How to Fix 鈥iPhone Won鈥檛 Sync with iTunes

If iTunes syncing still doesn鈥檛 work, you might consider authorizing your computer. You can do this by:

  1. Launch iTunes on your computer where you want to sync.
  2. Go to 鈥淎ccount > Sign In鈥 at the top of iTunes window and sign into your Apple ID.
  3. Go to Account > Authorizations > Authorize This Computer on the menu bar.
  4. Put in your password, then click Authorize.

iTunes sync

After that, you should be authorized to transfer files to and from that computer.

What Does "iPhone is synced with another iTunes library" Mean?

iTunes sync

If you try to sync iPhone to new computer, you might run into the message "iPhone is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library.鈥 Basically, what this means is that you have previously synced your iPhone with another iTunes library, and the software is warning you that if you sync it with a new library, you could lose this data.

Everything that was previously in your iPhone library will be lost, and you will only have the contents of the new library on your iPhone after the sync. Be careful when you see this message, and considering syncing in a different way if you have songs that you don鈥檛 want to lose.

How to Sync iPhone to More Than One Computer without Erasing

How about manually adding iPhone files from a new computer with iTunes? Well, this will also erase the old contents of your iPhone. Most traditional iTunes syncing methods will result in old data being erased. If you just want to add to it, but not erase, it鈥檚 a good idea to use iTunes alternative.

The good one that is great for this is iMyFone TunesMate. It allows you to sync iPhone to new computer without erasing, and you can add music /movies/files to iPhone without losing any data at all. In fact, you don鈥檛 even need to open iTunes to sync your data.

sync music to iPhone

How TunesMate Helps iPhone to Sync to New Computer without Erasing?

  • Sync files to iPhone from new computers/iTunes libraries (unlimited) without erasing.
  • Sync iPhone files to new computer/iTunes library, both purchased and free music are included.
  • Back up iPhone files to new computer and sync backups to iPhone when in need.
  • Support to sync music, movies, playlists, music videos, audiobooks, podcasts, iTunes U, TV shows, photos etc.
  • Trusted by thousands of users (every year) and reported by well-known media around the world.

Try It FreeTry It Free

How to Sync Music to iPhone from New Computer without Erasing?

Step 1: Install the free trial of TunesMate on computer and connect your iPhone to new computer.
Step 2: Launch TunesMate. Click on 鈥淢usic鈥 tab, then click on 鈥淎dd > Add File鈥.
sync music to iPhone
Step 3: Browse and select the music files on new computer. Click on 鈥淥pen鈥 to start syncing.
sync music to iPhone


Once done, you can open Music app on iPhone and enjoy the new songs.
If the music formats are not supported by iPhone, they will be automatically converted to compatible ones.

Great Features of TunesMate

  • It works with all iDevices, such as iPod, iPhone, and iPad, and works with Macs and PC鈥檚.
  • Two-way transfer: transfer from iPhone to computer, or from computer to iPhone.
  • Detect and delete duplicate files easily.
  • Share music/videos with friends even your devices are signed into different Apple IDs.
  • Never have to worry about any loss of data during transfer. TunesMate will add files to iDevice or library, but not take them away.
  • Edit file info and playlists to smartly manage your library.
  • Rebuild/restore iTunes library corrupted from (unlimited) iPhone/iPad/iPod.

Generally rated 4.9 (122 participated)