As we know,iTunes does not let us transfer files from iPhone to PC. We should need third party app to transfer iPhone 3G to PC.

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Transfer iPhone 3G to PC
How to transfer files from iPhone 3G to PC? iTunes does not let you transfer files
from iPhone to PC. iTunes blocks this function since it is the tool with one way to
transfer files from iTunes to iPhone. You must utilize other tools to achieve that. You
should need third party app to transfer iPhone 3G to PC.
Cucusoft iPod/iPhone to PC Transfer, a professional software, can provide best
method to transfer iPhone 3G to PC with incredibly high speed and remarkable
quality. You can have your iPhone 3G files on your Mac as you wish.
Step by Step Guide
How to Transfer Files from iPhone 3G to PC?
Step 1: Launch iPhone to PC Transfer and connect the iPhone 3G to PC
Launch Cucusoft iPhone/iTouch/iPod to PC Transfer and connect the iPhone 3G to PC. A
window will pop up. It means that the software are looking for your iPhone 3G device.

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Step 2: Select files on iPhone 3G to transfer
Cucusoft iPhone to PC Transfer enables your to transfer photo, video, music and playlist on
iPhone 3G to PC easily. For example, you can use it to move photo from iPhone 3G to your
PC and then backup the photo on local hard disk.

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Step 3: Start transfer iPhone 3G to PC
Simply click the button "Start Transfer" and you can move iPhone 3G files to PC.
Step 4: Select where you want to store the files
After click the button "Start Transfer", a pop up will show. Please select "Transfer to Disk
only" if you want to transfer to PC.
When the iPhone 3G to PC transferring finished, a window will pop up. It shows that how
many files have been done. You can click the Yes button to view the output files.