Step 1: Free Download FLV to 3GP Converter
Step 2: Launch the FLV to 3GP Converter, and Click "add" button to input FLV video files to be convertered.

Step 4:Under the "Profile" settings: choose Mobile Phone 3GP. Then click the folder button, select the destination folder you want the converted 3GP to store.

Step 5: Click "Start" button.
the process shall be looked like this:

After successful converting FLV to 3GP , the converted FLV files shall be stored in the folder you have previously selected .
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Note: Converting FLV format to 3GP is just part function of Emicsoft
FLV Converter which is distributed by Emicsoft Studio.