Need help with 3gp videos on my cell phone?

It is easy to operate. Just few clicks are OK.
Here is the specific guide for you to follow:
tipard
Hope it useful for you.
I think the Need4 Video Converter is your best choice,It alway works well for me.
Supported formats.

The excellent DVD to Apple TV software also enables you to custom file size.

Inut Video Formats: AVI (DivX, XviD, etc.), DV AVI, MP4 (Sony PSP, Apple TV, iPod, iPhone, BlackBerry, etc), WMV (including Zune), ASF, FLV, 3GP, 3GP2, 3GPP, 3GPP2, QuickTime (MOV, QT), DVD, VOB, IFO, VIDEO_TS, AUDIO_TS, MPG, MPEG 1,2,4, MOD, DAT, MJPEG, VCD, SVCD, H.263. NEW! M2T, MTS, MKV, VRO
Output Video Formats: AVI (including DivX, XviD, MJPEG, and other codecs), MP4 (Sony PSP, Apple TV, iPod, iPhone, etc), WMV (including Zune) 3GP, 3GP2, 3GPP, 3GPP2, QuickTime (MOV, QT), FLV, MPG, MPEG 1,2,4, H.263, H.264, Real Media (RM, RMVB).

It can Convert DVD to BlackBerry video for Blackberry Storm 9530 9500, 8800.

Output Video for Mobile Devices: iPod, iPhone, Apple TV, PSP, Zune, PDA/Pocket PC (including BlackBerry), Creative Zen, Archos, Epson media players, any cellphone.
You can see detail and Guides in here:
kooksoft
I hope this may help you.
You can try Tipard Video Converter. It supports the mutual conversion between all the video formats.
Input Formats: MPG, MPEG, MPEG2, VOB, MP4, M4V, RM, SWF, RMVB, WMV, ASF, TS, MKV, AVI, 3GP, FLV, MPV, MOD, TOD, MP3, MP2, AAC, AC3, WAV, MID, MIDI, WMA, M4A, RA, RAM etc..

A tool for GPhone and related users for rip DVD to GPhone supported formats, such as MPEG-4, H.264 GPhone video.

Output Formats: MP4, H.264, AVI, MP3, WMV, WMA, FLV, MKV, MPEG-1, MPEG-2, 3GP, 3GPP, VOB, DivX, Mov, RM, RMVB, M4A, AAC, WAV, OGG, RA etc..
It also has strong editing functions of video effecting, video trimming, video cropping, video joinning.
For more informaion and free download from:
tipard
It helps you converter moving videos between all popular formats, Enjoy the highest conversion speed on the market!