My iPhone 5 volume button does not work when the phone is locked
When my iphone 5 is locked the volume buttons are not working. I have to unlock my phone in order to change the volume using the volume buttons. Is this normal for the iphone 5 or is there something wrong because I know that the volume buttons can be used when locked when I had the iphone 4
iPhone 5, iOS 6.1.3, New iPhone 5