How to Put Videos on iPhone 4, iPhone 4S
With the new iPhone 4S released on the market, like hot cakes, hundreds of thousands of iPhone 4S are sold all at once. The large, high-resolution screen makes iPhone 4S perfect for watching videos. However, videos are of any kind formats like AVI, WMV, FLV, MKV, AVCHD. You can not put everything on iPhone 4/iPhone 4S because iPhone only supports H.264, MPEG-4, MP4 video.
To put videos on iPhone 4/iPhone 4S, you have to convert videos into the compatible format. Here I recommend Aiseesoft iPhone 4S Movie Converter which can convert videos to iPhone compatible format such as MP4, M4V for playback on iPhone, iPhone 4 with best video quality and sound effect. Don't worry about the settings which are the optimized presets. Now, below is the step by step showing how to convert videos to iPhone 4/iPhone 4S with iPhone 4S Movie Converter.
Step 1 Run the program and import files
Simly click "Add Video" to import videos to the program. Download Link.

Step 2 Output settings
Set the output format - from the "Profile" drop down list, choose the profile according to your device. ie. iPhone > iPhone 4S H.264 Video(*.mp4).

If you are care enough, you can save a bunch of money. Yeah, this is program works on almost Apple devices including iPad, iPod and iPhone. With this program, you can easily convert any videos for your iPhone, iPad and iPod. Sounds great.
Set the output destination at "Destination". After the conversion, you can approach the output file quickly by clicking "Open Folder".
Step 3 Start to convert at "Convert"!