What is 103.9' s number?

Answer 1

-- On the FM radio dial, it's 103.9 MHz.

-- On the telephone, it's going to be a lot harder to come up with an answer.

At the present time (April 2013), in the USA, Canada, and Mexico, there are

413 radio stations all licensed to broadcast on 103.9 in different places.

We have no way to know which one you listen to, since you neglected to

provide call letters, or even to mention where you're located.