Remaining king of the wireless hill

London, April 5 (Bloomberg) Wireless service providers don't come any bigger than Vodafone. At the end of last year, the carrier had more than 78 million subscribers on every continent except Antarctica, and when penguins start sporting cell phones, Newbury-based Vodafone probably will be there to sign them up as well. Vodafone makes no secret of the fact that it wants to stay king of the wireless hill, and it's betting on third generation to help do this. It is a gamble that may backfire, according to some analysts. In addition to the approximately $20bn it spent last year on Euro...