The document summarizes key mobile trends from the week ending September 14, 2012. Some of the trends discussed include Instagram rolling out an updated mobile photo page, Apple announcing new features for the iPhone 5 like an 18% thinner design and face tracking camera, and a study finding that 21% of shoppers make more unplanned purchases via mobile shopping apps. It also mentions that smartphones make up the majority of mobile ad impressions and that Google updated its Google Wallet app to support mobile shopping without entering credit card details.