TELECOMMUNICATIONS

* Sprint Corp. filed for an initial public offering by its wireless communications unit that will raise as much as $604 million. The shares issued through the IPO will track the performance of Sprint PCS, a provider of digital wireless services. Sprint will devote all of the proceeds to the wireless unit, which will use the money for working capital and to build out its network for personal communications services. Sprint shares fell 63 cents to close at $77.25 on the NYSE.