The 26 million unit volume would mean a decline of 45% between the December and June quarters. A year ago, Apple's iPhone volume declined from 37 million in the Christmas quarter to 26 million in the June quarter of 2012. That 30% decline was partly a result of how slight an upgrade the iPhone 4S represented compared to the iPhone 4. Now Wall Street has started anticipating zero volume growth between the June quarters of 2012 and 2013… while global smartphone shipment volume soars by more than 30%.