Take after the beneath specify steps to discover the answer for your concern:
You need to check that you turned mute on.
You have to erase the third party applications if you have, because some third party alarm applications may have conflicted with the built-in clock application in iPhone or iPad.
Again create your Alarm. In any case, delete each one of the alarms and close the application, by then open the application and include your alerts once more. A couple of customers have settled this issues by this method.
