Making a half dozen attempts to guess your login info or typing each digit of a credit card account certainly can get in the way of following through on impulse purchases, which is exactly how you'd categorize FarmVille cash or a featured flick that you know you may not have time to watch within the month. The solution is carrier billing, eliminating those precious seconds between impulse and reconsideration, and Telefonica has just signed on to offer the service to Facebook, Google, Microsoft and RIM account holders. The partnerships will enable O2 users in Germany or Movistar subscribers in S