I think what he means is that the GPS connects for location information to his carriers server (aGPS).
To disable this, you have two options.
The easy one is to download this:
http://www.freewarepocketpc.net/ppc-...tion-tool.html
You'll find an option under GPS to disable assisted GPS. You'll need .NET 3.5 installed on your phone for it to work.
This second option is much more involved, and if you're not comfortable with it, avoid it. It will however survive hard resets and keep GPS from connecting no matter what. You would need a program called QPST (you won't find it here, need to google it). You'll need your MSL to get into the device with that program. You can use BAFs MSL grabber, and you CAN find that on this site.
You might try a data disabler program like NoData first to see if this is something you really want to do. When you see how long a GPS lock takes, you might reconsider.
Two things to start with. QPST MISTAKES CAN SERIOUSLY SCREW UP YOUR PHONE. If you haven't used it before, google for online tutorials. There is an option to read from phone and save to file, that way if you screw it up, you can restore the original settings. DON'T BLAME ME IF YOU SCREW UP YOUR PHONE!!! As long as you do the QPST backup to file on your PC, you should be ok if you need to restore things. Secondly, by disabling the aGPS (that is why your phone connects to the data network) it will take a very long time to get GPS locks. If you're ok with that, then read on...
Once you have both QPST and your MSL code, you can put your phone in DMR mode by entering ##3424 if it's a Verizon device, or ##3424# if it's a Sprint device. Then plug it into your computer and let it detect the device. Open QPST on your computer, and when it connects, go to service programming and enter your MSL when it asks you for it. (You should have it now if you used BAFs MSL Grabber) If it asks you what type of device it is, the last selection in the drop down box works for me, but you'll get messages about the device type changing after updating items and that's ok. Go to the GPSOne tab, and write down any and all info you find there. What you'll want to do is delete the server IP listed there. It will look like xxx.xxx.xxx.xxx. Make it 0.0.0.0. Also change your port number to 0. Change PDE transport to something besides IP (I can't remember what other options are there, but any should work). Also change the last box labled Position Calculation from PDE to any of the other options in QPST (again, I can't remember what the other options are, but any will work). Write changes to device.
THIS WILL BREAK YOUR AGPS!!! Your phone shouldn't connect when obtaining position now. You will have to reverse the steps to correct this if you need it to work as it does now. It will also take a VERY LONG TIME to get GPS locks. But that is the sacrifice if you don't want it to connect to your data network.