Step 1: Free download FLV to 3GP Converter and install it.
Step 2: Open this FLV to 3GP converter suite Pro:

Step 3: Click
button to input FLV file(s), batch FLV to 3GP supported, you can at the same time add as many as possible, but here I suggest add 1-10 FLV video files the same time for better stable running performance, ofcourse, this is varied by your computer configration and the FLV files size.
Step 4: under Profile selection: click download arrow, Choose: 3GP Video Formats(*.3GP)
.
under output Folder , Click "Change" button to select the destination folder you want the converted 3GP to store. (the default folder is stored under file: c:\outputFolder\)

Step 5: Click
convert button to start convert FLV to 3GP.
Then the Converting FLV to 3GP process shall be looked like this

After successful converting FLV to 3GP, the converted 3GP files shall be stored on the folder you have previously selected.
With this powerful FLV to 3GP converter, not only can convert FLV to 3GP . you can also convert FLV to almost all other popular video formats. but all the process is the same, Just Free download and enjoy it.