None of Verizon's current phones (including the Droid X) have the radio hardware neccessary to use 4G. You'll have to wait until 4G capable handsets are released next year.
At this time that information is not available. You can follow the link below to sign up for updates concerning our services.
https://email.vzwshop.com/servlet/formlink/f?NFOQU&SOURCEID=WEB_DGF_VZW_SUPPORTNAV
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