Hi all...a real cell phone novice here in need of some expert advice: I bought a LG CU400 phone on ebay that was obviously marketed for Cingular service. The phone has all of the features I'm looking for but I would prefer to keep my current Metro PCS service. How do I go about converting the new LG phone to Metro service? Also, my current Metro phone (Nokia) does not have a sim card but the LG phone does. Is the sim card absolutely required for the LG phone to work? Please advise if you can. Thanks.