over several different wireless networks. The name BlackBerry was coined by the marketing company Lexicon Branding. The name was chosen out of about 40 potential names, because of the resemblance of the keyboard's buttons to that of the drupelets that compose the blackberry fruit, and the instant pronunciation which reflected the speed of this push email system. The original BlackBerry devices, the RIM 850 and 857, used the DataTAC network. In 2002, the more commonly known convergent smartphone BlackBerry was released, which supports push email, mobile telephone, text messaging, Internet faxing, Web browsing and other wireless information services. BlackBerry gained market share in the mobile industry by concentrating on email. BlackBerry began to offer email service on non-BlackBerry devices, such as the Palm Treo, through the proprietary BlackBerry Connect software. The original BlackBerry device had a monochrome display while newer models installed color displays. All newer models have been optimized for "thumbing", the use of only the thumbs to type on a keyboard. The Storm 1 and Storm 2 include a SureType keypad for typing. Originally, system navigation was achieved with the use of a scroll wheel mounted on the right side of device models prior to the 8700. The trackwheel was replaced by the trackball with the introduction of the Pearl series, which allowed four-way scrolling. The trackball was replaced by the optical trackpad with the introduction of the Curve 8500 series. Models made to use iDEN networks, such as Nextel, SouthernLINC, NII Holdings, and Mike also incorporate a push-to-talk (PTT) feature, similar to a two-way radio. On January 30, 2013, BlackBerry announced the release of the Z10 and Q10 smartphones. Both models consist of touch screens: the Z10 features an all-touch design and the Q10 combines a QWERTY keyboard with touchscreen features. During the second financial quarter of 2013, BlackBerry sold 6.8 million handsets, but was eclipsed by the sales of competitor Nokia's Lumia model for the first time. On August 12, 2013, BlackBerry announced the intention to sell the company due to their increasingly unfavourable financial position and competition in the mobile industry. Largely due to lower than expected sales on the Z10, BlackBerry announced on September 20, 2013, that 4,500 full- and part-time positions (an estimated 40% of its operating staff) have been terminated and its product line has been reduced from six to four models. On September 23, 2013, Fairfax Financial, which owns a 10%