Originally Posted by upgrayedd

Here's another way to disable cell data:
1. Use Anycut to create a shortcut to "Testing"
2. Click on Testing.
3. Click on Phone Information
4. Hit Menu button
5. Click on More
6. Click on Disable data connection

This turns off all data access. Note that GPRS service switches to "disconnected".
Now you should have a phone that does voice calls, but no data access.
To re-enable cell data, do the reverse.

I now do this when I am not planning to use cell data for a while. It seems to improve the battery life.