Newb questions

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http://androidforums.com – Hey all. I'm really new to android and I have some questions. I have the optimus net from net10. As to my understanding, it runs off Sprints towers, but sprint has a contract with verizon so that they can roam on verizon towers. Can my phone roam on verizon towers? I notice that my data icon and bars are sometimes white instead of green. Does this mean my phone is roaming? Thanks in advance guys. (General)