A few people mentioned it above. If a woman is acting a little needy, then that's a symptom of something else. She is obviously feeling a little ignored in her life. Pay her some extra attention from time to time, and you will find she won't feel the need to call you as often as she does. The more you ignore a woman, and act irritated or uninterested when she calls, the more and more emotionally needy she will become. The neediness is a symptom, of something bigger. Humouring her when she rings, will not fix the problem.