When i go to switch my phone on vibrate it doesn't always vibrate (you know how you click the button down and it vibrates?) and it also doesn't show that bell with the line through it.. although it does go into silent mode - BUT NOT VIBRATE. 
If i then put it onto loud, and then back to vibrate it'll be normal.. but it doesn't work first time.
Why is this?? x

If i then put it onto loud, and then back to vibrate it'll be normal.. but it doesn't work first time.
Why is this?? x