2007 Altima Radio Issues

We have a 2007 2.5 Altima.When listening to our radio (base version/single CD) we sometimes hear very loud sounds from the right speaker. If you've ever been near a computer when a cell phone rings, you've probably heard the sound. Whatever signal is being picked up comes through whether the radio is on or not. Has anyone else experienced this sort of thing? When we are listening to the radio and the sound is transmitted, it is very loud and we can barely hear the radio over the sound. We're having a hard time explaining the problem to the service tech.

Are you sure that it is not your cell phone that is causing the "interference"?