long distance telephone signals

[ena]

Advances in technology allow for long distance telephone signals to be transferred through means of microwaves, satellite transmissions, and through the World Wide Web.

[paul01]

Microwave signals have the advantage of being more focused, and more resistant to interference than radio waves. Long distance phone calls were carried from tower to tower via microwave signals. Today, some cell phone networks and wireless devices such as Bluetooth® use low frequency, or longer-length, microwave signals.