Brew OS is used by Sprint Nextel, metroPCS, Cricket Wireless, U.S. Cellular, Verizon, Syringa Wireless, and AT&T (in the HTC Freestyle) in the US and by the 3 network in much of Europe, the UK and Australia on many mobile phones produced especially for their network.
UTF-16 is used by the Qualcomm BREW operating systems; the .NET environments; and the Qt cross-platform graphical widget toolkit.
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UAProf production for a device is voluntary: for GSM devices, the UAProf is normally produced by the vendor of the device (e.g. Nokia, Samsung, LG) whereas for CDMA / BREW devices it's more common for the UAProf to be produced by the telecommunications company.