Hi, I have a Galaxy S4. When my text messages come in, I now hear my alert and it was not always like this. Problem is that my phone is set to VIbrate when I am at work. It is vibrating with calls and giving my alert when I get a text message. This is driving me crazy. I'm not sure what I could have changed to turn on this feature but I want it off. My alert is a whistle and should not be heard until the phone is set to audible. Please help me .