The following step-by-step tutorial is going to show you how to convert 3GP to iPhone 4S video using 3GP to iPhone 4S Converter so that you can transfer 3GP files to iPhone 4S and play 3GP video on iPhone 4S.
Download and Install 3GP to iPhone 4S Converter
Download the latest version of 3GP to iPhone 4S Converter. Install and launch it.
Add 3GP Files
Click the "Add Video" button to import the 3GP file. Alternatively, you can click "File -> Add Video Files..." to add the 3GP file. You can also batch import 3GP files by clicking "File -> Batch Add Video Files".
Choose Output Format
From the "Profile" drop-down list, choose iPhone MPEG-4 Video as the output format.
Note: You can also adjust the audio/video parameters to customize a specific profile that best fits your needs. Click to learn how to customize profile.
Start Converting 3GP to iPhone 4S
Click the "Start Encode" button to start to convert 3GP to iPhone 4S.
Transfer Output to iPhone 4S
After you get the output files, launch your iTunes and transfer them to your library. Then you will be able to transfer the converted files to your iPhone 4S with the sync of iTunes.