(Telecompaper) Helios Towers is reviving plans for an initial public offering, Bloomberg reported, citing people familiar with the matter. Its advisers are resuming preparations for an IPO that could value Helios at about USD 3 billion and it is considering filing for the share sale as soon as this year, they said. The tower owner is weighing London and Johannesburg as listing venues, though it has not made a final decision, one of the people said.