DigitByte Software for Windows, Mac, iPhone, iPad, iPod – free download
How To Convert 3GP to ASF
This following application listed in this page should offers the easiest way of converting 3GPP (.3gp) files to ASF for you with re-encoding technology to preserve the original quality as possible as it can.
About 3GP to ASF Converter 
WinMPG Video Convert brings the wonderful feature to convert 3GP file to ASF playable on your Windows Media Player. it has many other features for bigger range of video files conversions and create professional-looking videos, the program includes more easier intuitive editing, options for output files. it even lets an amateur can convert a variety of video files without any technology, also, the program contains a large library of video codecs and let you convert videos easily. Assuming you have a lots of video formats needed to be converted, thus, this is the one you are looking for!
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Note:
The above downloads are the downloaders from Regnow of Digital River Inc (Nasdaq: DRIV). When it is running, the firewall on your computer may popup the request for Internet access. They have been tested and are 100% CLEAN.