For iPhone 4 users, you need an iPhoe 4 Transfer to help you transfer various files from iPhone 4 to PC or from PC to iPhone 4.
In detail, files from iPhone 4 to PC can be music, video, images, TV shows, podcast, iTunes U, eBooks, camera roll, Ringtone, SMS, Contacts, voice memos as well as camera shot and son on. Oppositely, you can transfer videos, audios and images from PC to iPhone 4.
It even supports to convert Blu-ray, DVD, and video files to iPhone 4 formats. Furthermore, with this iphone 4 Transfer, you can share movies, music and photos with your fiends. Apart from iPhone 4, it is also compatible with all iPhone /iPad /iPod versions. So you can transfer files to iPhone, iPhone 3G, iPhone 3GS, or iPad 2 and so on.
More interestingly, you can make your own ringtones with this transfer. You can record your vice or a song and make it into ringtone. Having sensitive identification, it can also recognize your information and show them in detail.
Besides, iPhone 4 to PC Transfer can also help you transfer file from iPhone 4 to PC. It is specially designed to transfer iPhone 4 files to PC in the single direction.
Here are the steps to transfer files from iPhone 4 to PC.
Step 1: Connect.
Download this iPhoe 4 Transfer and run it. Connect your iPhone 4 to PC.
Step 2: Select the video.
Click “Movies” or “Music” or other options to display all your files to transfer in details.
Step 3: Transfer.
Click “Transfer” button to start to transfer your files.
It will come to 100% when the work is done. And you just need to click “OK” button to finish task.
Tip: If you are a Mac user, you can choose iPhone 4 to Mac Transfer to help you. It is a special designed for Mac users to transfer files between iPhone 4 and Mac.
No matter for Windows users, or for Mac users, these transfer products can provide enough help for you. And they all allow free trail. So you can have a try. 
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I am fond of wireless transfer app which lets me easily download videos between my computer and my iPhone 4. It works like a charm. I never need iTunes or USB cable any more. It is well worth a try if the wifi network is easily available.
http://www.wirelesstransferapp.com/