o. As more networks adopt LTE, worldwide compatibility for roaming will be fea- sible. Roaming is dependent on the availability of LTE devices that operate on the same frequencies. An example is smartphones that operate on 700MHz and 2.1GHz networks. The roaming issue is especially significant for subscribers on CDMA2000 networks such as those of Verizon Wireless and China Telecom, both of which are deploying LTE. Current CDMA2000 customers have limited options for roaming because most of the rest of the world uses either GSM 2G services or WCDMA 3G technologies. Mobile broadband is particularly significant in developing areas such as countries in Africa. These countries are currently experiencing the most growth of anywhere in the world with regard to the number of mobile phones, and for the most part, there are few landline broadband connections. It is expected that these areas will adopt mobile broadband for residential consumers rather than building out landline broadband infrastructure. Current LTE implementations, based on Release 8 of the LTE standard, support between 2Mbps and 30Mbps downlink from the provider to the subscriber. True IMT- Advanced, 4G LTE, is based on Release 10 and will support 100Mbps. Mobile and Wi-Fi Networks The Benefits of LTE for Carriers LTE provides benefits to carriers as well as subscribers. The most important among them are a simplified infrastructure and cell sites with fewer pieces of equipment to manage. Moreover, LTE software and hardware can be installed on standard computer platforms SO that carriers can choose from a wide range of equipment manufacturers. LTE cell sites also support more users per cell site than 3G technologies because the air interface is more flexible and uses spectrum more efficiently. LTE is flexible on the amount of spectrum allocated to calls. The options are 1.4-, 3-, 5-, or 20MHz-wide bands. In high-traffic areas, carriers can allocate 1.4MHz bands to calls. During light traffic periods, 20MHz bands can be utilized. When carriers upgrade to LTE,