How do I transfer a 3gp video to my EnV Touch?

I think the Need4 Video Converter is your best choice,It alway works well for me. It helps you converter moving videos between all popular formats, Enjoy the highest conversion speed on the market!

Video converter is the easiest way to get your video in the format you want, convert video and audio to iPod, PSP, iPhone, Zune, Xbox.

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).
Output Video for Mobile Devices: iPod, iPhone, Apple TV, PSP, Zune, PDA/Pocket PC (including BlackBerry), Creative Zen, Archos, Epson media players, any cellphone.

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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..
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.

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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.