I am doing this from memory of something I read about, but never used. So take it with a grain of salt.
Settings>Connections>Connections
Manage Existing Connections under the bold "Sprint"
Edit the Sprint PCS connection
Next
Next
Enter a User name and leave everything else blank
Hit Finish
What this should do, is bring up a password prompt whenever you try and use data. You can then choose to enter the information, or hit cancel. Again, I have not ever done this, but I hear it works.
There is also a setting you can change which will tell your phone to never use EVDO, and stick to 1x, but you need your MSL for that, and I am fairly certain that you can still use data on 1x, but I may be wrong.
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