Tethering enables your cellular telephone or similar Internet-enabled mobile device to connect other devices such as netbooks, laptops or PDAs to the Internet. Mobile phones that offer tethering typically connect to other devices via Bluetooth or a USB cable in order to provide them with Internet access.
A key advantage of tethering is that it makes it possible for devices to connect to the Internet through a cellular data provider in situations and places where other Internet access options such as Wi-Fi, cable modem, DSL or analog modem aren't available. Some mobile phone carriers offer tethering at no additional cost, while others either don't offer it at all or charge additional data rates for tethering.
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