Since its sneaky, silent unveiling at February's Mobile World Congress, the GSM version of the Pre has been a total no-show -- good for Sprint publicity-wise, probably, but bad for virtually every other carrier and potential customer in the world. If we had to guess, the silence can be attributed to heated negotiations between Palm and dozens of potential networks; the company knows it has a probable winner on its hands, and it has every reason to play hardball to get the best exclusivity deal that it possibly can. The Guardian is now reporting that O2 has fended off competing offers from Vodafone and Orange to nab the Pre in the UK, meaning that the carrier -- Britain's largest