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LG only released two LG Optimus phones with the Windows Phone operating system, compared to 20 unique Android smartphones. The first of these was the LG Optimus 7, released in November 2010. It was followed by the LG Quantum, alternatively Optimus 7Q or Optimus Quantum, a variant with a physical keyboard. [citation needed]
It was a hands-free mobile headset that earned the "Best of show Technology Award" at COMDEX. The first Bluetooth mobile phone was the unreleased prototype Ericsson T36, though it was the revised Ericsson model T39 that actually made it to store shelves in June 2001.
As the software industry was developing, the question of how to best document software programs was undecided. This was a unique problem for software developers, since users often became frustrated with current help documents. [2] Some considerations for writing a user guide that developed at this time include: the use of plain language [2]
The following year saw the release of the LG Optimus 3D, the world's first mobile phone with glasses-free 3D display, [63] and LG Optimus 2X, the first with a dual-core processor. [64] In 2012 LG worked with Google to build the Nexus 4 smartphone. [65] Other than the G3, LG officially unveiled the curved smartphone, LG G Flex, on 27 October 2013.
Headphones that use cables typically have either a 1 ⁄ 4 inch (6.4 mm) or 1 ⁄ 8 inch (3.2 mm) phone jack for plugging the headphones into the audio source. Some headphones are wireless, using Bluetooth connectivity to receive the audio signal by radio waves from source devices like cellphones and digital players. [5]
In the UK, use of wireless microphone systems requires a Wireless Telegraphy Act license, except for the license free bands of 173.8–175.0 MHz and 863–865 MHz. In 2013 the UK communications regulator, Ofcom , held an auction in which the UHF band from 790 MHz to 862 MHz was sold to be used for mobile broadband services.