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A telephone is a device that lets you talk to people who are a long, long way away from you - almost anywhere else in the entire world. Telephones are the most common appliance in the world.
More recently, telephones that don't need to be connected to the phone network by wires have been invented. These are called mobile phones.
More recently, telephones that don't need to be connected to the phone network by wires have been invented. These are called mobile phones.