Publisher Summary unbounded mobile communications (UMC) is a nascent market. Initially there were few handset manufacturers that would boldly step into this market. Since wireless carriers were concerned about WiFi cannibalizing their minutes or subscribers, they were more than mildly reluctant to back dual-mode offerings. Indeed, in some markets, certain models of phones were introduced with dual-mode configurations while the same design was introduced into other markets with the WiFi radios absent. In some cases, when the WiFi radios were present, the network services were hobbled to only support halfduplex traffic and not the voice-required full-duplex. In this manner, the WiFi connection could be used to surf the Web but could not sustain a real-time voice connection. Each operating system used for mobile handsets has its own unique approach for supporting, making, and breaking network connections, whether wireless or wireline. Most have a communication manager that is responsible for managing network connections, but there are design differences that may be important in a purchase decision from any one vendor. By intent, the communications manager is supposed to present an abstracted network interface that simplifies the operational management of network access. All require baseline configuration where all possible network connections are profiled (with proper security), including Bluetooth, WiFi, and USB connections.