Here is a perfect guide I found and used from xilisoft website weeks ago. I think this is a best way to convert MOV, RM, AVI, WMV,MPEG to 3GP, 3G2, MP4.

Xilisoft 3GP Video Converter, now very popular, is a wonderful and useful converter for mobile phone users.
   
!!  Supports all mobile phone video formats including 3GP, 3G2 (3GPP2) and MPEG-4;
!!  Convert various formats including ; DVD, VCD, SVCD, MOV, RM, AVI, MPEG, WMV, MPEG to 3GP, 3G2 and MPEG-4; ;
!!  Convert 3GP to popular audio files, including MP3 and WAV.

Do you want to play movies on your phone? Please follow this guide to meet your needs.

1. Download, install, and run Xilisoft 3GP Video Converter.
 
2. Load the file(s): Click the "Add" button in the main interface or choose "Add" in the "File" menu to add the
original files you want to convert.





3. Highlight the file you want to convert, then the software will automatically detect the "Duration" and "Bit
Rate" of the loaded file, and some advanced info such as the video and audio codec will also be detected. You can find the file information in the recording area.



Tip: It supports multithreading and batch conversion. You can select all files you want to convert and this software will automatically encode them, even if these files use different settings.

4. You can preview the file in the left preview window to confirm whether you loaded the right file or not. Just click to play it. When the movie is playing, will be all available. Please Note: This function is only for preview purpose.



Tip: Use "Remove" button to remove the loaded file which you highlight. This can help you remove the wrong file. Use "Clear" button to clear all the files loaded. Those buttons can also be found in the "File" menu.

5. Select the target output format: In "Profile" combo-box, you could choose what format you want to convert your files to. And all the target formats are shown in the dropdown list.



Tip: The software allows setting different output formats for different files, depending on what you like.
All encoders/codecs are built-in. The software integrates with all video/audio encoders/codecs. Users can convert all supported formats once download the program.

6. Set output mode: After selecting certain output format, the right panel will show general standard of the
format. By clicking certain setting, you may specify it. Or just keep the default settings.



Tip: It supports clip or segment conversion. You can convert any clip or segment by setting the start point and duration at will. For example, you want to rip a clip from 00:03:20 to 00:08:00, please click "Start time" to set the starting time 00:03:20 and click "Duration" to specify the length 00:04:40.
For sync problem, you may lower down the video bit rate to have a try. You can also try to solve it by adjusting the frame rate.

7. Select the output folder by clicking the "Browse..." button or directly enter a path in "Destination" box. The "C:\temp" is set as the default destination folder.



8. Begin to convert: Finally, press the "Encode" button. Note: The default setting is all item(s) checked. If you only want to rip certain item(s), check it/them, click "Encode", and then Xilisoft 3GP Video Converter will rip them one by one. You would see the info "Completed" in the status column after a successful conversion.



Tip: You can choose "Preferences..." in the "Settings" menu to set how many files you can convert
simultaneously before you start the conversion process.
During the process of converting, you can "Pause" or "Stop" it at anytime if you click certain buttons. 
 
9. After the files are successfully ripped, you may click the "Open" button to browse the output files.
 
To Check: Supported mobile phone list

How to get the best video quality on your mobile phone?

Pls get me free convert of RM to AVI or MPEG or DAT software.

Regards,

E.Sudarshan.

  good job, why not have a look at http://www.dvd-guides.com/component/option,com_smf/Itemid,95/topic,13937.0, another best way.

hey, everyone. what a surpise xilisoft comany has givento us. i just found that they had released many products for mac. i am looking forward for themfor a long time. for examlple, xilisoft DVD Copy express for mac, xilisoft dvd to ipod convertr for mac and xilisoft video converter for mac. what i like best is video converter for mac which convert between all popular video formats like AVI, MP4, 3GP, MOV.

I have been using this total video converter for a long time.
it supports video formats such as MP4, MOV, 3GP, AVI, WMV, RM, MPEG-1, MPEG-2, FLV and ASF.  All these video formats can be converted to one another with excellent quality.

Good guide!
After I tryed it, I recommend you to try Daniusoft DVD to Mobile Phone Suite which could convert any DVD/ video to AVI, MP4, WMV, 3GP in a good quality which fits all popular phone.

More wonderful iPhone converter at http://iphone-converter-soft.com.

news: they have released Xilisoft iPod Rip both for Windows and for Mac that is of iPod management software to copy and transfer music and movies.
  
http://www.xilisoft.com/ipod-rip-mac.html