The phrase "doing number" typically refers to the act of scamming or deceiving someone. Some antonyms that could be used to describe the opposite of "doing number" include honesty, integrity, and transparency. These are all traits that reflect a person who is upfront and truthful in their dealings, rather than trying to trick or deceive others. Other antonyms that could be used to describe the opposite of "doing number" might include fairness, morality, and ethics, as these concepts all center around treating others with respect and kindness, rather than trying to take advantage of them. Ultimately, using the right antonym for "doing number" will depend on the context and the specific situation at hand.