The latest data from ABI Research analyst Michael Morgan provides a valuable insight into the world's 10 largest branded cell phone makers in the first quarter of 2011. The information collected by Morgan provides sales data, vendor strategy and their competitive position in the marketplace. While most market research firm restrict their findings to the top five handset manufacturers, ABI has gone a step further by listing the top 10. Of note, the ABI figures detail "sell in", or handset shipment into the retail channel, as against "sell out", or sales to end users. The research only ranks handsets that carry the developer's brand, and ignores handset that have been rebranded by an operator without identifying the actual manufacturer. Special feature