Smartphones and tablets such as those running Nokia's Maemo (N900), Apple's iOS and Google's Android operating system can also be used as universal remote controls.
A number of devices from vendors such as Samsung, LG and Nokia include a built-in IR port that can be used as a remote, while others require a physical attachment, or 'dongle', be connected on to the phone when used as a remote. The dongle is required to convert the electrical control signals from the phone into infra red signals that are required by most home audio visual components for remote control. However it is also possible to implement a system that does not require a dongle. Such systems use a stand-alone piece of hardware called a 'gateway', which receives the electrical control signals from the smartphone in Bluetooth or wi-fi form and forward them on in infra red form to the components to be controlled.
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