Recently I was on a call to my work and there was this strange beeping / tone that sounded like an Emergency Services Alert or something. It would beep every few seconds regularly for a while, then stop for a few minutes and then start again. I do not believe the other side of the call could hear it. I checked my data alerts and I am not roaming so I am not certain what this could be. It also sounded very different from the typical beeping sound of a button press. Any ideas?