I would ask this,
Is 4729 the SID for your area?
Are you in a cricket market? <------- Are there cricket stores in your town/city?
I ask because looking at crickets coverage map, Roanoke, Virginia, is a partner coverage area. Meaning, if you do get service it could be terminated for abuse of the partner coverage. This could also explain why your not getting a connection to cricket (possibly no cricket coverage there only Sprints). Try going down to Greensboro and see if it works in the native cricket coverage. "I know it's a long drive" but it would be a good test on a theory.
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