Dude!!!!! i have a i590 flip phone that i am locked out of. When sim is in place and i boot it up, first screen says "unit code". I do not know code. Shouldn't there be an override code i can enter to get phone operable? I am attempting to use a boost sim in a nextel phone as well, but i dont think one should affect the other. Obviously if it is lookin for a unit code, if i have that i will be good...thanks yall