How can I prevent my phone from using any kind of internet? I have a weird plan and my phone went over its bandwidth usage this month... mostly just syncing up with Gmail, Twitter etc. So right now, every 5 minutes or so, my phone is telling me that it has spent 40 cents here and 30 cents there using up my prepaid money.

I have done the following:  


Turned off Wifi (my phone doesn't see any WiFi spots anyway right now)
Turned off all apps
Turned off syncing of data


However its still dinging me here and there and I need my phone minutes to last until it automatically reloads in two days. I've noticed that I will kill certain apps and then I find out they are turned back on... and syncing even though I told the phone not to.

Short of putting the phone on airplane mode (which I don't want to do because I'm expecting an important phone call - also my phone then becomes totally useless.), I can't seem to keep it from using the 3G network!
Just kill the APN Connection settings. Somewhere under settings. And there is actually a switch for mobile internet. Disable that as well. Worked like a charm for me. If you can't find it, add the Power Savings widget to your home screen, it has that option