Headed by Congress, which includes the House of Representatives and the Senate. The main task of these two bodies is to make the laws. Its powers include passing laws, originating spending bills (House), impeaching officials (Senate), and approving treaties (Senate). <span />
Answer:
Radio waves are used to transfer signals to and from the cell phone. Modern mobile phone networks use cells because radio frequencies are a limited, shared resource.
All of the cell sites are connected to telephone exchanges (or switches), which in turn connect to the public telephone network.