
The editor's answer:
This is a common question for iPhone user. When you use iTunes to transfer music such as MP3 to iPhone. If you don't shut down the auto sync function on iTunes. Your iPhone music will be overwrite by the new MP3. So, you can close the auto sync setting on iTunes.
But there is another choice is that you can have a Mac to iPhone transfer to instead of iTunes. Here we recommand AVCWare Mac iPod to iPod Computer iTunes Transfer for you to transfer new MP3 to iPhone without iTunes. It is not only support iPod to Mac Transform, but also support iPhone to Mac transform and Mac to iPhone transform. Such as transfer MP3 music from Mac to iPhone, transfer photo from Mac to iPhone. What's more, this iPhone transfer is compatible with iPhone 3gs.
Want to try?

The Definitive Guide: Transfer new MP3 to iPhone without overwriting files
Step 1: Download and install iPod to iTunes Transfer
Firest of all, you need to download AVCWare Mac iPod to iPod Computer iTunes transfer on your Mac computer for you to to tranfer new MP3 to iPhone. What's more, to connect your iPhone to Mac, A USB cabble is necessary.
The most important of all. You need to install iTunes 7.4 version or later on your Mac. But is is not necessary to lauch iTunes during you transform music from Mac to iPhone with AVCWare Mac iPod to iPod Computer iTunes Transfer.
And, AVCWare Mac iPod to iPod Computer iTunes Transfer only allow you to connect one iPhone to Mac when sync.
Using either a FireWire or USB cable (the white one that came with your iPod), connect the iPod to the computer in which you're trying to copy the music. If iTunes comes up, ignore it without clicking anything; we're going to use OS X itself to copy the music.
Step 2: Lanch Mac to iPhone transfer
Run the Mac mp3 to iPhone transfer on Mac, If your iPod(iPod shullfe, iPod classic, iPod Nano, iPod touch , video iPod. totall supported)ha s successfully connected to your computer via USB cable or connect your iPhone to Mac with USB cable. After done, the iPod/iPhone icon and its library and playlists will appear in the Device list.
Step 3: Start transferring MP3 from Mac to iPhone now
Can you see the "Add files" button on the top of the Mac to iPhone transfer. Yes, just click the button to borwser and find the folder your MP3 on Mac hard disk. You can transfer a single MP3 from Mac to iPhone or select more than one MP3. This Mac to iPhone transfer support batch mode.

Now, just waiting. This software is the smart choice for you to transfer MP3 music files to Mac and add files from Mac to iPhone.
Absolutely, It is a good iPod to iTunes Transfer. Without iTunes. Add music files to iPhone at anytime you want. Easy to operate.
After done, you can eject iPod/iPhone by one of the following methods:
Method 1
Right click on your iPod/iPhone icon in the Device list, and then choose the Eject option from the right-click menu.
Method 2
Click Eject button on the right of Device list, and choose the iPod/iPhone you want to eject from the submenu.
AVCWare Mac iPod to iPod Computer iTunes Transfer is a little but practical iPod backup software, which provides you a perfect solution for transferring files between iPod and Mac, iPod and iTunes . With it's help, you can easily and quickly transfer movies songs, photos from from your iPod to iTunes. more easier than ever! What's more, it is an application for you to transfer iPod to Mac, iPod to iPod, iPod to iPhone and more.
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