Possbile to use Droid X with Boost or Virgin?

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http://forum.xda-developers.com – Hey- I am considering buying a Droid X used from Amazon. I want to use it with a prepaid plan from either Boost Mobile or Virgin Mobile. Is this possible? What other carriers beside Version can I use with the X. I know it's a CDMA phone so I won't be able to use it on AT&T or T-Mobile. Thanks! wws12 (HowTos)