Hello I purchased a Black Cingular V3 from a guy who said it was Software unlocked..Not hardware unlocked. It a new phone ( or Refirbed) He said A guy unlocked the video recorder ( it does work) we used his Cingular Sim from his phone to test it out. He also said If I put my sons T- mobile sim in it , it would work..but he also said it may get a subsidy code prompt. I'm confused. If I have T-Mobile service and a Cingular Phone who do I call if I get this message ?

Thanks