Disabling CDMA?

[pizzaboy192]

Here's my issue: I own the Verizon Locked version of the Fathom and my friend owns the GSM Unlocked version.
The problem is that even the GSM one likes to default to Verizon when it does not find a signal, and makes it difficult for my friend who is not very phone literate and likes things to "just work" but wants to keep the Fathom.
Has anyone found a way to disable the CDMA half from defaulting or has a script that can be run to reset it back to GSM without having to dig through options?
I've tried different things, but I feel like i'm missing something. I want to remove the options for the phone to go into Global Mode or CDMA mode, and to disable the "Switch to Global Mode" popup too.
I'm tempted to disable the CDMA half by screwing up the MEID so it can't register on Verizon, but I doubt that will work.

Thanks for the help!

[windseye]

I share Pizzaboy's desire for a way to completely disable the switch to Global Mode message when signal is lost.