Step 1: Free download and install this 3GP Editor software, and then run it
Step 2: Import 3GP videos that you want to edit.
Click Import Media Files, import 3GP files and you will enter into the following window

Step 3: Add loaded 3GP videos to timeline.
Just drag and drop the files you want to edit to the time line
Step 4: Select the 3GP video and Edit loaded 3GP videos when previewing
Click
button trim 3GP video or trim one file to several segments
Click
button to add translation between 3GP videos
Click
button to customize video effects
Step 5: Save edited 3GP files.
Click
on the top of the main interface, the following save movie dialog will pop up.

- Save to File - create an AVI, MPEG, WMV, or MOV video file onto your computer hard disk drive.
- Save to Disc - create a DVD-video disc with a menu, or a DivX/Xvid disc compatible with most up-to-date hardware DVD players.
- Save to Devices - create a video for a mobile player, mobile phone or a gaming console of yours and upload it right to the device. Other most popular devices are also supported.
- Save for Web - create a video that can be streamed via web and save it into RM or MOV format.
Select according to your opinion and then click "next","next"...until you see "Create" button and then click it.
Once the saving or converting is ok, the following interface will pop up
.
Once you see the above picure, it means that this 3GP Editor has finish the whole operation. Now, you can enjoy your edited mobile phone 3GP videos.
So easy! Free download this 3GP Editor and have a try.