Just follow step by step instructions below, you will find it is really easy and handy!
Step1. Launch Cucusoft iPhone Video Converter
Open the software, you will see the screenshot as the following. You can download the trial version free , also you can buy the full version, $29.95.



Step2. Click 'Open file' button to load the FLV file(s) you'd like to convert. The iPhone converter software supports batch conversion mode.



Step3. The default output format is iPhone 480*320 Mpeg-4 video. If you'd like to change this, click "Profile" button, set the output format to iPhone 480*320 mpeg4 video, iPod MP4 video, iPod h264 video or iPhone audio (MP3). Here, you can also set video size, frame rate and more.

Step4. Hit 'Convert' button to start converting FLV to iPhone.

Step5. Transfer the converted video or audio files to iTunes library and sync them to iPhone.

Video to iPhone