MOV is the file extension for the QuickTime multimedia file format. The default player is Apple's QuickTimePlayer. As so many people have iPhone 4 of their own now, besides listening to music, they also use it to watch favorite videos. However, you may not be able to play MOV files on your iPhone 4 unless you convert MOV to iPhone 4 format.
As you know, iTunesdoesn't provide us the function of convert video to iPhone 4. So we need turn to third-party software for help. Try Cucusoft iPhone 4 Converter Suite. This iPhone 4 Video Converter is especially designed for iPhone 4 users to convert QuickTime .mov files to iPhone 4 and also convert MOV and other audios for iPhone 4.
This guide is for you to convert MOV to iPhone 4 video successfully step by step. Then you can enjoy video or movie wherever and whenever.
Step 1: Launch Cucusoft iPhone 4 Converter Suite, you will see the screenshot as the following. Then click the second button on the right to run iPhone 4 Video Converter.

Step 2: Click 'Open file' button to load the MOV file(s) you'd like to convert.
Step 3: The default output format is iPhone 480*320 Mpeg-4 video. If you'd like to change this, click "Profile" button.
Step 4: Hit 'Convert' button to start converting MOV to iPhone 4.

Done! Now you can transfer the converted video or audio files to iTunes library and sync them to iPhone 4. Converting MOV to iPhone 4 is so easy. Just have a try now!
Related Link: RMVB to iPhone 4