The story behind AT&T’s failed acquisition of T-Mobile is by now old hat, but it was nonetheless the biggest in mobile during the fourth quarter. As the dust from the fallout continues to settle, answering the question of where AT&T will find more spectrum will be key. That, along with Apple’s Siri technology, trends in the tablet space and some serious headaches around mobile data privacy dominated the discussion in mobile over the past few months. This report serves as a look back at the final quarter of 2011 as well as a primer for what to expect in the coming weeks and months. Companies mentioned in this report include Amazon, Dish Network, Leap Wireless and Carrier IQ. For a full list of companies, and to read the full report, sign up for a free trial.