I can't answer this with 100% certainty, but something to try is load ROM Manager and make a backup of your current ROM. Then try flashing another ROM and see what happens. If your phone doesn't work then you can reload your backup (which is a perfect image of your current ROM) and your back in business. I do know when you flash a ROM it doesn't change your Baseband.
AFAIK your baseband is what should control your phone communications ie: Verizon or Cricket (this is the part I am not 100% sure about and hopefully someone with greater knowledge can clarify.)
Also if you currently have SPRecovery then you can do a nandroid backup from the recovery mode. I prefer to use ROM Manager as a personal choice.
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