According to the study done by International Data Corporation (IDC) Worldwide Quarterly Mobile Phone Tracker, the total number of android units shipped worldwide reached 136 million which is 75% of the total Smartphone shipment of 181.1 million units. The second most shipped are the IOS units accounting for only 14.9% of the total Smartphone shipment. While Blackberry occupied 3% of the share, the Nokia, Fujitsu, Sharp, and Sony supported Symbian had 4.1 % which is more than the 3.6% share of Windows mobile -Nokia Lumina is the only commendable windows handset released in 2012.
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Mobile phones are used for a variety of purposes, including keeping in touch with family members, conducting business, and having access to a telephone in the event of an emergency. Some people carry more than one cell phone for different purposes, such as for business and personal use. Multiple SIM cards may also be used to take advantage of the benefits of different calling plans—a particular plan might provide cheaper local calls, long-distance calls, international calls, or roaming. ;,:`