Will Google (NSDQ: GOOG) and its push for open networks put more pressure on the struggling MVNO sector? Red Herring has a rather muddled story on how MVNO's will fare in the face of more open networks. Alex Besen, president of research firm the Besen Group argues that open networks will favor mass-market, cheap cell phones, which will put MVNO's such as Helio under pressure. Helio offers slick ha