The following are tips I've picked up for modifying a Samsung SPH-A660 (VI660) cellphone

Sections: General Stuff : Sample Files : Using your cellphone as a modem

General Stuff

• Instructions on how to communicate with the cellphone can be found here - http://home.comcast.net/~jna03/a660/. It is an excellent resource and many thanks should be given to its creator. The following are some additional comments I had after visting that site.
  • It seems you also have to delete the ams/EndTransaction file as well as the ams/amsregistry file. Both files are rebuilt after power cycling.
  • Sometimes after power cycling your phone it might appear that all your downloads have been wiped out. This can occur if one of your jad or gcd files is invalid. Your files are still there, you just have to fix the offending file or delete it. I've provided some sample jad and gcd files below.
  • If you are just starting out, I would highly recommend that you make sure that you can get a single ringtone, image, or game to work on your phone before attempting do to a batch upload.

• GCDCreator doesn't seem to create valid GCD files for the VI660 (or at least it doesn't for me). You might have better luck modifying one of the gcd files I have provided below (see the next bullet for tips on how to do this). You should download them instead of just copy and pasting the text since that might mess up the formating. The format for gcd files can be found here http://rumkin.com/tools/sprint/faq/index.php?Topic=gcd.

  For most of the fields it doesn't matter what you type (though they have to be there). The important aspects of the gcd file are the following

  	Content-Type:	This has to match your media. Visit http://rumkin.com/tools/sprint/formats.php for the different types
  	Content-Name:	This should be a unique string for each file so that you can identify the files on your phone
  	Content-Size:	This has to match the byte size for the file

• I've received a lot of questions about this, so here is how I generally create a new GCD file
  • If I'm going to add a new image to my phone, I first make a copy of a gcd file that I know works (for example, the sample gcd file I have below) and rename it to the next sequential cnts number. I then open it with MS Wordpad and change the Content-Name and the Content-Size. Note that the Content-Size must match the byte size for the image you are uploading. I leave everything else the same (i.e. the url, version, etc).

    I do a similar process for ringtones.

    When you are editing a gcd file in Wordpad make sure you do not remove or add any linefeeds since this will add DOS style linefeeds to the file. Also make sure you save the file as a text document and not as an RTF or other format.

    If I want to create a descriptor file from scratch, which I have done for some games, then I will use one of the text editors that comes with cygwin (a linux-like environment for windows). These editors use unix style linefeeds by default.

• The screensize of the VI660 is 128 x 112
   
• I'm currently using BitPim version 0.7.25

Sample Files

Using Your Cellphone as a Modem

Note: the following works for the VI660 and you can connect to the verizon network without a username and password (this is especially strange since verizon is not my carrier). I don't know if you will be charged for using it though, I'll have to wait and see on my next bill.

Update: I was charged forty cents per minute for using my cellphone as a modem (my cellphone contract does not include internet access). I don't think I'm going to be doing that again.

I copied this from someone else's webpage so not all of the instructions are applicable to the VI660. I only followed the directions starting at #12.