And can we assume you've already tried going to settings, and then (depending on phone model) choosing "sounds", "notifications", or anything related to these two things, and made sure you were set to recieve the sound?
kieshagirl, let's make sure that the notifications are alerting you when they come in. Are you not getting the notification alert while connected to wi-fi service or also while you are connected to the cellular network as well? Do the notification show up in the notification bar at the top of the device? Please keep me posted.
KevinR_VZW Follow us on Twitter @VZWSupport If my response answered your question please click the "Correct Answer" button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!