I would like to disable voice but not 3G. Here's why.
Verizon doesn't allow simultaneous voice and data. I thought I could get around this by using a third party app like Google Voice. However, I see that a new change to Google Voice is "Does not require data connectivity for making calls to all numbers you previously called". So my thought is, if I forcibly disable voice maybe it will use my data connection. I *want* it to use my data connection, that is my use for it!
I would like simultaneous voice and data because I frequently talk on the phone while traveling, but this inhibits the data connection, which means my GPS position reports can't be updated on my server which means anybody I'm interested in sharing my position with can't see the latest position if I'm on the phone. Ridiculous!
There are other good reasons too... anything where you want to send data over 3G and don't want a phone call wrecking things.