 negotiating contracts to have its chips installed in some of the 120 different types of tablet computers that it has determined are being developed or are available worldwide. It now has chips that support voice and expects those to be qualified by carriers for various handsets. Mobile and Wi-Fi Networks THE MICROCELL TECHNOLOGY OF PICOCELLS AND FEMTOCELLS Picocells and femtocells are mini cell sites that are installed in residences, enterprises, arenas, and outdoor areas. Picocells cover larger areas, can handle more traffic, and were available earlier than femtocells. Femtocells are used in smaller sites such as homes. Both technologies provide relatively low-cost ways to add coverage inside buildings and at venues used for short-term services including athletic events and large conferences. Building owners rely on carriers to provide picocells and femtocells because only carriers have rights to spectrum used for mobile services. Picocells can cover about 5,000 square feet and femtocells about 2,000 square feet. Like traditional base stations, new picocells support multiple standards including third-generation (3G) and Long-Term Evolution (LTE) networks as well as multiple frequencies. Picocells Picocells are cell sites that cover larger areas and support a greater number of users (about 100) than femtocells (five or six). Depending on the size of the installation, the user or the carrier sets up and installs each picocell. For small installations, the carrier might mail picocells to the customer. Picocells are also referred to as super femtocells. Some picocells are automatically configured by the gateway at the carrier's data center. Coverage within buildings has long been a challenge for mobile carriers. Large buildings, airports, concrete parking lots, and tunnels are particularly hard places for which to provide coverage. It's extremely difficult to penetrate walls without turning up power on antennas too high. The height of buildings also creates problems. Locat- ing antennas higher up in the top floors 