How to use GTK signals?

Most mobile phones use digital signals rather than analog signals why is this?

• A question on my paper I need answering and I can't find one of these options which would you say was right? Most mobile phones use digital signals rather than analog signals why is this? 1) digital signals are less prone to interference 2) digital signals travel faster 3) digital signals can travel further 4) digital signals vary continuously

• Answer:

  Strictly speaking, none of the answers is correct but, allowing for the dumbed-downedness of your class, there is a likely "right" answer. Let's narrow it down: 1) Maybe. 2) No. They're all EM waves that travel at the speed of light. 3) No. They're all EM waves and weaken with distance to the same degree for a given frequency. 4) No. Analog signals vary continuously and analog is the opposite of digital. That leaves a probable answer of 1), but be aware that the judgment that they are less prone to interference relies on unstated assumptions, such as the definition of "prone to interference" and how it is being measured. Go for it anyway.