Femtocells and picocells -- every major mobile operator you can think is either planning or has started trialling a microcellular system. Cellular technology has limitations when used indoors, as consumers and enterprises know. The mobile telcos' solution is microcellular technology: femtocells and picocells, low-power cellular access points that operate in licensed spectrum to connect devices wirelessly to a mobile operators network, using the users' networks as backhaul. The mobile operators see them as essential to reduce churn and so gain market share and new revenues. And analysts predict huge growth in the market. This year will be critical for the technology. So what is it, who stands to win or lose, and who stands to win or lose?