United States Cellular Corporation, d.b.a. U.S. Cellular (NYSE: USM), owns and operates the sixth largest wireless telecommunications network in the United States, behind Verizon Wireless, AT&T Mobility, Sprint Nextel, T-Mobile USA, and MetroPCS. They currently serve about 6.2 million customers in 126 markets in 26 U.S. states. U.S. Cellular has recently rolled out a 3G network for many of its customers. The company has its headquarters in Chicago, Illinois.
In electronics and computing, firmware is a term often used to denote the fixed, usually rather small, programs and/or data structures that internally control various electronic devices. Typical examples of devices containing firmware range from end-user products such as remote controls or calculators, through computer parts and devices like hard disks, keyboards, TFT screens or memory cards, all the way to scientific instrumentation and industrial robotics. Also more complex consumer devices, such as mobile phones, digital cameras, synthesizers, etc., contain firmware to enable the device's basic operation as well as implementing higher-level functions.
There are no strict boundaries between firmware and software, as both are quite loose descriptive terms. However, the term firmware was originally coined in order to contrast to higher level software which could be changed without replacing a hardware component, and firmware is typically involved with very basic low-level operations without which a device would be completely non-functional. Firmware is also a relative term, as most embedded devices contain firmware at more than one level. Subsystems such as CPUs, flash chips, communication controllers, LCD modules, and so on, have their own (usually fixed) program code and/or microcode, regarded as "part of the hardware" by the higher-level(s) firmware.
Low-level firmware typically resides in a PLA structure or in a ROM (or OTP/PROM), while higher level firmware (often on the border to software) typically employs flash memory to allow for updates, at least in modern devices.