Making Calls
 

Hi Guys,

A bit of a random thing, but when I make calls normally when the phone starts ringing the little phone symbol starts to flash.
This randomly stopped, i know it may seem like nothing but I find it quite useful for drop calling and so forth.
A few times ive made calls and people have spoken and im still thinking it hasn't rung yet.

How can i fix this? :(

(N900)