Which video formats are supported by iPhone?
iPhone only support H.264 or MPEG-4 video codec and AAC audio codec.
If you want to watch AVI movies on you iPhone, you need a converter to transfer AVI into MPEG-4 movie.
BlazeVideo iPhone Video Converter will help you a lot which can convert HD videos, and QuickTime, FLV, RM, RMVB, AVI, WMV, ASF, MPG, MPEG, MPE, M1V, MPV2, MP4, DAT, MOV, VOB media files etc.
And the iPhone Video Converter supports iPhone 3G, iPhone 3GS, iPhone 4, iPhone 4 HD.
Let’s download BlazeVideo iPhone Video Converter and convert AVI to iPhone.
Step 1: Click Add File(s) to load AVI files.
Step 2: Customize your input videos to create your own video.

Clip any segment of your video to remain your favorite part.
Use Crop to cut off unwanted frame.
Click Watermark to add favorite text as watermark and adjust its position freely.
Click Subtitle to plug in desired subtitle and reset its vertical position.
Merge multiple video files into one with title or credits to continuously watch desired videos.
Step 3: Set output parameters
Click Setting, in Profile list, select iPhone as output. You can also adjust the output video size frame rate, video/audio bitrate, sample rate and audio channel to fit your iPhone.

The detailed parameters:
Video Size: 320*240, 480*320, 640*480, 720*480, 768*576, 960*640
Frame Rate: default, 12/15/20/23.97/24/25/29.97/30fps
Video bitrate: default, 512/640/768/900/1200/1500/2000/2500/3000/4000kbps
Sample rate: default, 22050/32000/44100/48000Hz
Channel: default, 1 Channel Mono, 2 Channels Stereo
Audio Bitrate: default, 64/96/128/160/192/256/512kbps
Step 4: Reset an output folder for the converted files and click Start to convert AVI to iPhone!

How do you feel like BlazeVideo iPhone Video Converter? Just try it!
What is AVI?
Audio Video Interleave (also Audio Video Interleaved), known by its acronym AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows technology. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. Like the DVD video format, AVI files support multiple streaming audio and video, although these features are seldom used. Most AVI files also use the file format extensions developed by the Matrox OpenDML group in February 1996. These files are supported by Microsoft, and are unofficially called “AVI 2.0″.(From Wikipedia, the free encyclopedia )
What is iPhone?
The iPhone is a line of Internet and multimedia-enabled smartphones designed and marketed by Apple Inc. An iPhone can function as a video camera, camera phone with text messaging and visual voicemail, a portable media player, and an Internet client with e-mail, web browsing, and both Wi-Fi and 3G connectivity. The user interface is built around the device’s multi-touch screen, including a virtual keyboard rather than a physical one. Third-party as well as Apple applications are available from the App Store, which launched in mid-2008 and now has well over 300,000 “apps” approved by Apple. These apps have diverse functionalities, including games, reference, GPS navigation, social networking, security and advertising for television shows, films, and celebrities.